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  • Should we have a database independent SQL like query language in Django? [closed]

    - by Yugal Jindle
    Note : I know we have Django ORM already that keeps things database independent and converts to the database specific SQL queries. Once things starts getting complicated it is preferred to write raw SQL queries for better efficiency. When you write raw sql queries your code gets trapped with the database you are using. I also understand its important to use the full power of your database that can-not be achieved with the django orm alone. My Question : Until I use any database specific feature, why should one be trapped with the database. For instance : We have a query with multiple joins and we decided to write a raw sql query. Now, that makes my website postgres specific. Even when I have not used any postgres specific feature. I feel there should be some fake sql language which can translate to any database's sql query. Even Django's ORM can be built over it. So, that if you go out of ORM but not database specific - you can still remain database independent. I asked the same question to Jacob Kaplan Moss (In person) : He advised me to stay with the database that I like and endure its whole power, to which I agree. But my point was not that we should be database independent. My point is we should be database independent until we use a database specific feature. Please explain, why should be there a fake sql layer over the actual sql ?

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  • How to get entire input string in Lex and Yacc?

    - by DevDevDev
    OK, so here is the deal. In my language I have some commands, say XYZ 3 5 GGB 8 9 HDH 8783 33 And in my Lex file XYZ { return XYZ; } GGB { return GGB; } HDH { return HDH; } [0-9]+ { yylval.ival = atoi(yytext); return NUMBER; } \n { return EOL; } In my yacc file start : commands ; commands : command | command EOL commands ; command : xyz | ggb | hdh ; xyz : XYZ NUMBER NUMBER { /* Do something with the numbers */ } ; etc. etc. etc. etc. My question is, how can I get the entire text XYZ 3 5 GGB 8 9 HDH 8783 33 Into commands while still returning the NUMBERs? Also when my Lex returns a STRING [0-9a-zA-Z]+, and I want to do verification on it's length, should I do it like rule: STRING STRING { if (strlen($1) < 5 ) /* Do some shit else error */ } or actually have a token in my Lex that returns different tokens depending on length?

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  • Hybrid EAV/CR model via WCF (and statically-typed language)?

    - by Pat
    Background I'm working on the architecture for a cloud-based LOB application, using Silverlight for the client, WCF, ASP.NET/C# for server and SQL Server for storage. The data model requires some flexibility per user (ability to add custom properties and define validation rules for them, for example), and a hybrid EAV/CR persistence model on the server side will suit nicely. Problem I need an efficient and maintainable technology and approach to handle the transformation from the persisted EAV model to/from WCF (and similarly allow the client to bind to the resulting data - DataGrid is a key UI element)? Admission: I don't yet know enough about WCF to understand if it supports ExpandoObject directly, but I suspect it will. Options I started off looking at WCF RIA services, but quickly discovered they're heavily dependent upon both static type data and compile-time code generation. Neither of these appeal. The options I'm considering include: Using WCF RIA services and pass the data over the network directly in EAV form (i.e. Dictionary), and handle the binding issue purely on the client side (like this) Using a dynamic language (probably IronPython) to handle both ends of the communication, with plumbing to generate the necessary CLR type data on the client to allow binding, and transform to/from EAV form on the server (spam preventer stopped me from posting a URL here, I'll try it in a comment). Dynamic LINQ (CreateClass() and friends), although I'm way out of my depth there and don't know what the limitations on that approach might be yet. I'm interested in comments on these approaches as well as alternative approaches that might solve the problem. Other Notes The Silverlight client will not be the only consumer of the service, making me slightly uncomfortable with option #1 above. While the data model is flexible, it's not expected to be modified heavily. For argument's sake, we could assume that we might have 25 distinct data models active at a given time, with something like 10-20 unique data fields/rules each. Modifications to the data model will happen infrequently (typically when a new user is initially configured).

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  • What is a good programming language/environment for Linux database applications?

    - by Dkellygb
    I could use some advice on my move from the Windows world to Linux. For my business, I have used VB6 and Microsoft Access with both Access databases and SQL server in the past. The easy to use forms, report writers and programming language were perfect for CRUD apps and analysis for our small hotel/restaurant business. After using Linux at home for some time I would like to convert our small business. Our server is already a Linux box using Samba. I am happy with the OpenOffice.org applications instead of Microsoft Office. The only thing which is holding me back is a desktop database application where I can develop the forms and reports we require. Base does not seem to be up to the job yet from my experience. I would like something like VB.Net with visual studio (express) but I would like to avoid Mono – I just don’t see the point of it. (You can correct me if I’m wrong.) But a good collection of forms, controls and a good report writer would be ideal. I have looked at web based stuff like Ruby on Rails, but I think a webserver for our 5 pc network is overkill. I don’t mind running a proper database on our Ubuntu 9.10 server. I may have exposed a few prejudices above but my mind is open. Any thoughts?

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  • How do I add the go language to gitg's list of viewable sources?

    - by Hotei
    Hoping a 'git' guru will help out here. I am just beginning to "git" for the first time and have (among other things :-) ) git and gitg installed from Ubuntu 10.4 / AMD64 distribution (ie. maybe not 'latest' version but not ancient). I am trying to look at the go code I've committed via gitg and in the "tree tab" it says :Cannot display file content as text. However, the "details tab" shows the diffs of the same file just fine. I know gitg's "tree tab" is working because I can use the tree view on *.c / *.html / *.txt etc just fine. Is there a way to tweak gitg into understanding that "*.go" is just text? A little more context: Installed gitg version is 0.0.5 - ie a version behind latest - 0.0.6 - source of which I am looking thru now. I do have a working /usr/share/gtksourceview-2.0/language-specs/ go.lang. It works just fine as highlighter in gedit. It appears that gitg may require displayable files to have a mime type of "text/plain", so I added that to go.lang No joy. gitg still fails on *.go I'm relatively sure the fix is simple, just don't know where to look.

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  • Are vector assignments copied by value or by reference in Google's Go language?

    - by Brian T Hannan
    In the following code, I create one peg puzzle then do a move on it which adds a move to its movesAlreadyDone vector. Then I create another peg puzzle then do a move on it which adds a move to its movesAlreadyDone vector. When I print out the values in that vector for the second one, it has the move in it from the first one along with the move from the second one. Can anyone tell me why it seems to be assigning by reference and not value? Are vector assignments copied by value or by reference in Google's Go language? package main import "fmt" import "container/vector" type Move struct { x0, y0, x1, y1 int } type PegPuzzle struct { movesAlreadyDone * vector.Vector; } func (p *PegPuzzle) InitPegPuzzle(){ p.movesAlreadyDone = vector.New(0); } func NewChildPegPuzzle(parent *PegPuzzle) *PegPuzzle{ retVal := new(PegPuzzle); retVal.movesAlreadyDone = parent.movesAlreadyDone; return retVal } func (p *PegPuzzle) doMove(move Move){ p.movesAlreadyDone.Push(move); } func (p *PegPuzzle) printPuzzleInfo(){ fmt.Printf("-----------START----------------------\n"); fmt.Printf("moves already done: %v\n", p.movesAlreadyDone); fmt.Printf("------------END-----------------------\n"); } func main() { p := new(PegPuzzle); cp1 := new(PegPuzzle); cp2 := new(PegPuzzle); p.InitPegPuzzle(); cp1 = NewChildPegPuzzle(p); cp1.doMove(Move{1,1,2,3}); cp1.printPuzzleInfo(); cp2 = NewChildPegPuzzle(p); cp2.doMove(Move{3,2,5,1}); cp2.printPuzzleInfo(); } Any help will be greatly appreciated. Thanks!

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  • Is Prolog the best language to solve this kind of problem?

    - by Milan Babuškov
    I have this problem containing some inequations and requirement to minimize a value. After doing some research on the Internet, I came to conclusion that using Prolog might be the easiest way to solve it. However, I never used Prolog before, and I would hate to waste my time learning it just to discover that it is not the right tool for this job. Please, if you know Prolog, take a look at this problem and tell me if Prolog is the right one. Or, if you know of some other language that is really suited for this. a + b + c >= 100 d + e + f >= 50 g + h >= 30 if (8b + 2e + 7h > 620) then y = 0.8 else y = 1.0 if (d > 35) then x = 0.9 else x = 1.0 5xa + 8yb + 5c + 3xd + 2ye + 2f + 6xg + 7yh = w. I need to find the values for a, b, c, d, e, f, g and h that minimize w. I'm not really asking for code, although I'd be grateful for some hint how to tackle this if Prolog is really good for it. Thanks.

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  • Configuring varnish and django (apache/modwsgi)

    - by Hedde
    I am trying to work out why my application keeps hitting the database while I have setup varnish infront of apache. I think I am missing some vital configuration, any tips are welcome This is my curl result: HTTP/1.1 200 OK Server: Apache/2.2.16 (Debian) Content-Language: en-us Vary: Accept,Accept-Encoding,Accept-Language,Cookie Cache-Control: s-maxage=60, no-transform, max-age=60 Content-Type: application/json; charset=utf-8 Date: Sat, 15 Sep 2012 08:19:17 GMT Connection: keep-alive My varnishlog: 13 BackendClose - apache 13 BackendOpen b apache 127.0.0.1 47665 127.0.0.1 8000 13 TxRequest b GET 13 TxURL b /api/v1/events/?format=json 13 TxProtocol b HTTP/1.1 13 TxHeader b User-Agent: curl/7.19.7 (universal-apple-darwin10.0) libcurl/7.19.7 OpenSSL/0.9.8r zlib/1.2.3 13 TxHeader b Host: foobar.com 13 TxHeader b Accept: */* 13 TxHeader b X-Forwarded-For: 92.64.200.145 13 TxHeader b X-Varnish: 979305817 13 TxHeader b Accept-Encoding: gzip 13 RxProtocol b HTTP/1.1 13 RxStatus b 200 13 RxResponse b OK 13 RxHeader b Date: Sat, 15 Sep 2012 08:21:28 GMT 13 RxHeader b Server: Apache/2.2.16 (Debian) 13 RxHeader b Content-Language: en-us 13 RxHeader b Content-Encoding: gzip 13 RxHeader b Vary: Accept,Accept-Encoding,Accept-Language,Cookie 13 RxHeader b Cache-Control: s-maxage=60, no-transform, max-age=60 13 RxHeader b Content-Length: 6399 13 RxHeader b Content-Type: application/json; charset=utf-8 13 Fetch_Body b 4(length) cls 0 mklen 1 13 Length b 6399 13 BackendReuse b apache 11 SessionOpen c 92.64.200.145 53236 :80 11 ReqStart c 92.64.200.145 53236 979305817 11 RxRequest c HEAD 11 RxURL c /api/v1/events/?format=json 11 RxProtocol c HTTP/1.1 11 RxHeader c User-Agent: curl/7.19.7 (universal-apple-darwin10.0) libcurl/7.19.7 OpenSSL/0.9.8r zlib/1.2.3 11 RxHeader c Host: foobar.com 11 RxHeader c Accept: */* 11 VCL_call c recv lookup 11 VCL_call c hash 11 Hash c /api/v1/events/?format=json 11 Hash c foobar.com 11 VCL_return c hash 11 VCL_call c miss fetch 11 Backend c 13 apache apache 11 TTL c 979305817 RFC 60 -1 -1 1347697289 0 1347697288 0 60 11 VCL_call c fetch deliver 11 ObjProtocol c HTTP/1.1 11 ObjResponse c OK 11 ObjHeader c Date: Sat, 15 Sep 2012 08:21:28 GMT 11 ObjHeader c Server: Apache/2.2.16 (Debian) 11 ObjHeader c Content-Language: en-us 11 ObjHeader c Content-Encoding: gzip 11 ObjHeader c Vary: Accept,Accept-Encoding,Accept-Language,Cookie 11 ObjHeader c Cache-Control: s-maxage=60, no-transform, max-age=60 11 ObjHeader c Content-Type: application/json; charset=utf-8 11 Gzip c u F - 6399 69865 80 80 51128 11 VCL_call c deliver deliver 11 TxProtocol c HTTP/1.1 11 TxStatus c 200 11 TxResponse c OK 11 TxHeader c Server: Apache/2.2.16 (Debian) 11 TxHeader c Content-Language: en-us 11 TxHeader c Vary: Accept,Accept-Encoding,Accept-Language,Cookie 11 TxHeader c Cache-Control: s-maxage=60, no-transform, max-age=60 11 TxHeader c Content-Type: application/json; charset=utf-8 11 TxHeader c Date: Sat, 15 Sep 2012 08:21:29 GMT 11 TxHeader c Connection: keep-alive 11 Length c 0 11 ReqEnd c 979305817 1347697288.292612076 1347697289.456128597 0.000086784 1.163468122 0.000048399

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  • Abnormally high amount of Transmit discards reported by Solarwinds for multiple switches

    - by Jared
    I have several 3750X Cisco switches that, according to our Solarwinds NPM, are producing billions of transmit discards per day. I'm not sure why it's reporting these discards. Many of the ports on the 3750X's have 2960's connected to them and are hardcoded as trunk ports. Solarwinds NPM version 10.3 Cisco IOS version 12.2(58)SE2 Total output drops: 29139431: GigabitEthernet1/0/43 is up, line protocol is up (connected) Hardware is Gigabit Ethernet, address is XXXX (bia XXXX) Description: XXXX MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive set (10 sec) Full-duplex, 100Mb/s, media type is 10/100/1000BaseTX input flow-control is off, output flow-control is unsupported ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:47, output 00:00:50, output hang never Last clearing of "show interface" counters 1w4d Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 29139431 Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 35000 bits/sec, 56 packets/sec 51376 packets input, 9967594 bytes, 0 no buffer Received 51376 broadcasts (51376 multicasts) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 51376 multicast, 0 pause input 0 input packets with dribble condition detected 115672302 packets output, 8673778028 bytes, 0 underruns 0 output errors, 0 collisions, 0 interface resets 0 unknown protocol drops 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier, 0 pause output 0 output buffer failures, 0 output buffers swapped out sh controllers gigabitEthernet 1/0/43 utilization: Receive Bandwidth Percentage Utilization : 0 Transmit Bandwidth Percentage Utilization : 0

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  • Fail2Ban adds iptable rules but they are not working?

    - by EApubs
    Fail2Ban just blocked my IP for 3 SSH attempts. It added the iptables rule and I can see it using the "sudo iptables -L -n" command. But I can still access the site and login through SSH! What might be the problem? Is it because im using CloudFlare? I have set Nginx to write the real IPs to the access logs instead of the Cloud Flare IP. Isn't it enough? Chain fail2ban-ssh (1 references) target prot opt source destination DROP all -- 119.235.14.8 0.0.0.0/0 RETURN all -- 0.0.0.0/0 0.0.0.0/0 The input chain : Chain INPUT (policy DROP) target prot opt source destination fail2ban-NoAuthFailures tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 fail2ban-nginx-dos tcp -- 0.0.0.0/0 0.0.0.0/0 multiport dports 80,8090 fail2ban-postfix tcp -- 0.0.0.0/0 0.0.0.0/0 multiport dports 25,465 fail2ban-ssh-ddos tcp -- 0.0.0.0/0 0.0.0.0/0 multiport dports 22 fail2ban-ssh tcp -- 0.0.0.0/0 0.0.0.0/0 multiport dports 22 ufw-before-logging-input all -- 0.0.0.0/0 0.0.0.0/0 ufw-before-input all -- 0.0.0.0/0 0.0.0.0/0 ufw-after-input all -- 0.0.0.0/0 0.0.0.0/0 ufw-after-logging-input all -- 0.0.0.0/0 0.0.0.0/0 ufw-reject-input all -- 0.0.0.0/0 0.0.0.0/0 ufw-track-input all -- 0.0.0.0/0 0.0.0.0/0 LOG all -- 0.0.0.0/0 0.0.0.0/0 LOG flags 0 level 4

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  • Disabling Keyboard Wakeup for Ubuntu 10.04 on Acer 1810TZ

    - by sybreon
    My Acer Aspire 1810TZ laptop suspends fine but wakes up on any slight key-press. I would like to disable this behaviour. I read that it involves disabling something in the /proc/acpi/wakeup but SLPB does not seem to be listed at all. root@1810TZ:/etc# cat /proc/acpi/wakeup Device S-state Status Sysfs node UHC0 S3 disabled pci:0000:00:1d.0 UHC1 S3 disabled pci:0000:00:1d.1 UHC2 S3 disabled pci:0000:00:1d.2 UHCR S3 disabled EHC1 S3 disabled pci:0000:00:1d.7 UHC3 S3 disabled pci:0000:00:1a.0 UHC4 S3 disabled UHC5 S3 disabled EHC2 S3 disabled pci:0000:00:1a.7 EXP1 S4 disabled pci:0000:00:1c.0 PXSX S4 disabled pci:0000:01:00.0 EXP2 S4 disabled PXSX S4 disabled EXP3 S4 disabled PXSX S4 disabled EXP4 S4 disabled pci:0000:00:1c.3 PXSX S4 disabled pci:0000:02:00.0 EXP5 S4 disabled PXSX S4 disabled EXP6 S4 disabled PXSX S4 disabled However, the relevant bits seem to be detected from dmesg. [ 0.357628] ACPI: AC Adapter [ACAD] (on-line) [ 0.357749] input: Power Button as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0C:00/input/input0 [ 0.357754] ACPI: Power Button [PWRB] [ 0.357817] input: Lid Switch as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0D:00/input/input1 [ 0.359319] ACPI: Lid Switch [LID0] [ 0.359390] input: Sleep Button as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0E:00/input/input2 [ 0.359394] ACPI: Sleep Button [SLPB] [ 0.359475] input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input3 [ 0.359479] ACPI: Power Button [PWRF] Not quite sure what to do next.

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  • Disabling Keyboard Wakeup for Ubuntu 10.04 on Acer 1810TZ

    - by sybreon
    My Acer Aspire 1810TZ laptop suspends fine but wakes up on any slight key-press. I would like to disable this behaviour. I read that it involves disabling something in the /proc/acpi/wakeup but SLPB does not seem to be listed at all. root@1810TZ:/etc# cat /proc/acpi/wakeup Device S-state Status Sysfs node UHC0 S3 disabled pci:0000:00:1d.0 UHC1 S3 disabled pci:0000:00:1d.1 UHC2 S3 disabled pci:0000:00:1d.2 UHCR S3 disabled EHC1 S3 disabled pci:0000:00:1d.7 UHC3 S3 disabled pci:0000:00:1a.0 UHC4 S3 disabled UHC5 S3 disabled EHC2 S3 disabled pci:0000:00:1a.7 EXP1 S4 disabled pci:0000:00:1c.0 PXSX S4 disabled pci:0000:01:00.0 EXP2 S4 disabled PXSX S4 disabled EXP3 S4 disabled PXSX S4 disabled EXP4 S4 disabled pci:0000:00:1c.3 PXSX S4 disabled pci:0000:02:00.0 EXP5 S4 disabled PXSX S4 disabled EXP6 S4 disabled PXSX S4 disabled However, the relevant bits seem to be detected from dmesg. [ 0.357628] ACPI: AC Adapter [ACAD] (on-line) [ 0.357749] input: Power Button as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0C:00/input/input0 [ 0.357754] ACPI: Power Button [PWRB] [ 0.357817] input: Lid Switch as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0D:00/input/input1 [ 0.359319] ACPI: Lid Switch [LID0] [ 0.359390] input: Sleep Button as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0E:00/input/input2 [ 0.359394] ACPI: Sleep Button [SLPB] [ 0.359475] input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input3 [ 0.359479] ACPI: Power Button [PWRF] Not quite sure what to do next.

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  • Are my iptables secure?

    - by Patricia
    I have this in my rc.local on my new Ubuntu server: iptables -F iptables -A INPUT -i eth0 -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A INPUT -i eth0 -p tcp --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --dport 9418 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A INPUT -i eth0 -p tcp --sport 9418 -m state --state ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --dport 5000 -m state --state NEW,ESTABLISHED -j ACCEPT # Heroku iptables -A INPUT -i eth0 -p tcp --sport 5000 -m state --state ESTABLISHED -j ACCEPT # Heroku iptables -A INPUT -p udp -s 74.207.242.5/32 --source-port 53 -d 0/0 --destination-port 1024:65535 -j ACCEPT iptables -A INPUT -p udp -s 74.207.241.5/32 --source-port 53 -d 0/0 --destination-port 1024:65535 -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --dport 443 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A INPUT -i eth0 -p tcp --sport 443 -m state --state ESTABLISHED -j ACCEPT iptables -P INPUT DROP iptables -P FORWARD DROP 9418 is Git's port. 5000 is a port used to manage Heroku apps. And 74.207.242.5 and 74.207.241.5 are our DNS servers. Do you think that this is secure? Can you see any holes here? Update: Why is it important to block OUTPUT? This machine will be used only by me.

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  • How do I relay output from a soundboard into input on skype?

    - by Anthony
    I'm trying to find a way to play audio from flash soundboards to people on skype. I apparently do not have Wave/Stereo mix/What u hear supported on my soundcard (I have windows 7 professional). I only have one soundcard, and I'm usually using headset. However, I have another laptop with windows vista on it that does have stereo mix available. The problem is, it still doesn't work. When I click an audio bit it just doesn't do anything. It plays on my end, but not to the person on the other end. Is there a way to do this? What am I missing?

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  • How to set the default input focus/caret position in Outlook 2007 stationery?

    - by Ronald
    When using stationery/templates in Outlook 2007, I want to set the caret position between the header and footer by default. Now you have to click in the right place to start typing, which is annoying... Is the some special markup that would allow me to set a default caret position? Something like this (for Outlook Express 5/6): http://email.about.com/od/outlookexpresstips/qt/et041205.htm.

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  • Shell wrong encoding

    - by csch
    Somehow I managed to screw up my shell-encoding. An example: root§server:ç£ cat --help Usage: cat ¡OPTION¿... ¡FILE¿... Concatenate FILE(s), or standard input, to standard output. -A, --show-all equivalent to -vET -b, --number-nonblank number nonempty output lines -e equivalent to -vE -E, --show-ends display $ at end of each line -n, --number number all output lines -s, --squeeze-blank suppress repeated empty output lines -t equivalent to -vT -T, --show-tabs display TAB characters as ^I -u (ignored) -v, --show-nonprinting use ^ and M- notation, except for LFD and TAB --help display this help and exit --version output version information and exit With no FILE, or when FILE is -, read standard input. Examples: cat f - g Output f's contents, then standard input, then g's contents. cat Copy standard input to standard output. Report cat bugs to bug-coreutils§gnu.org GNU coreutils home page: <http://www.gnu.org/software/coreutils/> General help using GNU software: <http://www.gnu.org/gethelp/> For complete documentation, run: info coreutils 'cat invocation' root§server:ç£ It should look like: root@server:~# cat --help Usage: cat [OPTION]... [FILE]... Concatenate FILE(s), or standard input, to standard output. -A, --show-all equivalent to -vET -b, --number-nonblank number nonempty output lines -e equivalent to -vE -E, --show-ends display $ at end of each line -n, --number number all output lines -s, --squeeze-blank suppress repeated empty output lines -t equivalent to -vT -T, --show-tabs display TAB characters as ^I -u (ignored) -v, --show-nonprinting use ^ and M- notation, except for LFD and TAB --help display this help and exit --version output version information and exit With no FILE, or when FILE is -, read standard input. Examples: cat f - g Output f's contents, then standard input, then g's contents. cat Copy standard input to standard output. Report cat bugs to [email protected] GNU coreutils home page: <http://www.gnu.org/software/coreutils/> General help using GNU software: <http://www.gnu.org/gethelp/> For complete documentation, run: info coreutils 'cat invocation' root@server:~# I have no clue what went wrong, do you have any ideas?

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  • Centos iptables configuration for Wordpress and Gmail smtp

    - by Fabrizio
    Let me start off by saying that I'm a Centos newby, so all info, links and suggestions are very welcome! I recently set up a hosted server with Centos 6 and configured it as a webserver. The websites running on it are nothing special, just some low traffic projects. I tried to configure the server as default as possible, but I like it to be secure as well (no ftp, custom ssh port). Getting my Wordpress to run as desired, I'm running into some connection problems. 2 things are not working: installing plugins and updates through ssh2 (failed to connect to localhost:sshportnumber) sending emails from my site using the Gmail smtp (Failed to connect to server: Permission denied (13)) I have the feeling that these are both related to the iptables configuration, because I've tried everything else (I think). I tried opening up the firewall to accept traffic for ports 465 (gmail smtp) and ssh port (lets say this port is 8000), but both the issues remain. Ssh connections from the terminal are working fine though. After each change I tried implementing I restarted the iptables service. This is my iptables configuration (using vim): # Generated by iptables-save v1.4.7 on Sun Jun 1 13:20:20 2014 *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A INPUT -p icmp -j ACCEPT -A INPUT -i lo -j ACCEPT -A INPUT -p tcp -m tcp --dport 8000 -j ACCEPT -A INPUT -p tcp -m tcp --dport 80 -j ACCEPT -A INPUT -p tcp -m tcp --dport 465 -j ACCEPT -A INPUT -j REJECT --reject-with icmp-host-prohibited -A FORWARD -j REJECT --reject-with icmp-host-prohibited -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A OUTPUT -o lo -j ACCEPT -A OUTPUT -p tcp -m tcp --dport 8000 -j ACCEPT -A OUTPUT -p tcp -m tcp --dport 465 -j ACCEPT COMMIT # Completed on Sun Jun 1 13:20:20 2014 Are there any (obvious) issues with my iptables setup considering the above mentioned issues? Saying that the firewall is doing exactly nothing in this state is also an answer... And again, if you have any other suggestions for me to increase security (considering the basic things I do with this box), I would love hear it, also the obvious ones! Thanks!

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  • Why does Snow Leopard report incorrect battery levels for Bluetooth input devices after switching them to Apple rechargeable batteries?

    - by GeneQ
    I have a Magic Trackpad, Magic Mouse and the Apple Wireless keyboard. They work fine. Two days ago, doing my part for the environment, I changed all their batteries to Apple rechargeable batteries. Today I noticed that the battery level meter for all three devices report the wrong battery level. The trackpad reports 93% charge, the keyboard 75% charge and the mouse 65% charge. This can't be right; these are fully charged new batteries. They can't possible drop that much within 48 hours. Has anyone else encountered this problem? And are there any solutions?

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  • Assembly Level Language? Unlock iPhone 3GS with latest Baseband. Need Opinion

    - by getkenny
    Hi Guys, So its more like advice i need. I got 2 iPhone 3GS (Bootloader 06.02 and BB 05.11) which are lying around useless cause it was bought it from US and now i am in Dubai. Cannot use the phone because there is no unlock. Now rather than waiting and relying on other people to provide a unlock for the baseband , i was thinking of learning what it takes to unlock a iPhone. I currently don't even know what i got to learn to do this. I understand from soem reading around that i will need to learn ARM to understand the baseband and try to find a exploit: is it correct? I really want to help people out in getting their iPhones working. Also the iPhones cost was $645 each (16GB) so its not like Apple is going to loose any money of it, the person who bought it for me thought that if your not buying with an AT&T contract it means that it is unlocked but it is not true. I need help, i am willing to learn and you guys are the best bunch around to give me advice. Regards.

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  • Does anyone know where I could find a 2 input USB voltage meter?

    - by John O
    What we really need is a tiny UPS, of sorts. We'll be hooking up a solar cell and a battery to a single board computer. Currently, that SBC is a custom Pic32 device, and it does it's own UPS and voltage monitoring duties. I've been tasked with trying to replicate all of its features with off the shelf products... and for the most part I've succeeded. But I don't currently have any way to switch between two sources of juice, or monitor when they're getting low. These guys have something: http://www.mini-box.com/picoUPS-100-12V-DC-micro-UPS-system-battery-backup-system I really like it, the price is well within the budget. We might even work it in though it does 12V and I'll probably be using 5V... there are enough engineers on hand to figure out something. But I'd still have no idea what the voltage was for the PV or battery. I was hoping that there was some simple little USB multimeter thing that I could use to monitor this with, but I can't seem to come up with anything. I've found all sorts of cool hardware, but nothing that will help us. Does anyone know of anything?

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  • SNMP query - operation not permitted

    - by jperovic
    I am working on API that reads a lot of data via SNMP (routes, interfaces, QoS policies, etc...). Lately, I have experienced a random error stating: Operation not permitted Now, I use SNMP4J as core library and cannot really pinpoint the source of error. Some Stackoverflow questions have suggested OS being unable to open sufficient number of file handles but increasing that parameter did not help much. The strange thing is that error occurs only when iptables is up and running. Could it be that firewall is blocking some traffic? I have tried writing JUnit test that mimicked application's logic but no errors were fired... Any help would be appreciated! Thanks! IPTABLES *nat :PREROUTING ACCEPT [2:96] :POSTROUTING ACCEPT [68:4218] :OUTPUT ACCEPT [68:4218] # route redirect za SNMP Trap i syslog -A PREROUTING -i eth0 -p udp -m udp --dport 514 -j REDIRECT --to-ports 33514 -A PREROUTING -i eth0 -p udp -m udp --dport 162 -j REDIRECT --to-ports 33162 COMMIT *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT -A INPUT -p icmp -j ACCEPT -A INPUT -i lo -j ACCEPT ..... # SNMP -A INPUT -p udp -m state --state NEW -m udp --dport 161 -j ACCEPT # SNMP trap -A INPUT -p udp -m state --state NEW -m udp --dport 162 -j ACCEPT -A INPUT -p udp -m state --state NEW -m udp --dport 33162 -j ACCEPT ..... -A INPUT -j REJECT --reject-with icmp-host-prohibited -A FORWARD -j REJECT --reject-with icmp-host-prohibited COMMIT

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  • Enabling http access on port 80 for centos 6.3 from console

    - by Hugo
    Have a centos 6.3 box running on Parallels and I'm trying to open port 80 to be accesible from outside tried the gui solution from this post and it works, but I need to get it done from a script. Tried to do this: sudo /sbin/iptables -A INPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT sudo /sbin/iptables-save sudo /sbin/service iptables restart This creates exactly the same iptables entries as the GUI tool except it does not work: $ telnet xx.xxx.xx.xx 80 Trying xx.xxx.xx.xx... telnet: connect to address xx.xxx.xx.xx: Connection refused telnet: Unable to connect to remote host UPDATE: $ netstat -ntlp (No info could be read for "-p": geteuid()=500 but you should be root.) Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN - tcp 0 0 127.0.0.1:6379 0.0.0.0:* LISTEN - tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN - tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN - tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN - tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN - tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN - tcp 0 0 0.0.0.0:37439 0.0.0.0:* LISTEN - tcp 0 0 :::111 :::* LISTEN - tcp 0 0 :::22 :::* LISTEN - tcp 0 0 ::1:631 :::* LISTEN - tcp 0 0 :::60472 :::* LISTEN - $ sudo cat /etc/sysconfig/iptables # Generated by iptables-save v1.4.7 on Wed Dec 12 18:04:25 2012 *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [5:640] -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A INPUT -p icmp -j ACCEPT -A INPUT -i lo -j ACCEPT -A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT -A INPUT -j REJECT --reject-with icmp-host-prohibited -A INPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT -A FORWARD -j REJECT --reject-with icmp-host-prohibited COMMIT # Completed on Wed Dec 12 18:04:25 2012

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  • cisco asa + action drop issue

    - by ghp
    Have created a tunnel between 10.x.y.z network and 122.a.b.c ..the tunnel is up and active, but when I try the packet tracer output ..I get the ACTION as drop. I have also enabled same-security-traffic permit intra-interface. Can someone help me what does this drop mean? Result: input-interface: inside input-status: up input-line-status: up output-interface: outside output-status: up output-line-status: up Action: drop Drop-reason: (acl-drop) Flow is denied by configured rule Packet Tracer output @Shane Madden: please find below the packet tracer output. CASA5K-A# CASA5K-A# config t CASA5K-A(config)# packet-tracer input inside tcp 10.x.y.112 0 122.a.b.c 0 Phase: 1 Type: ROUTE-LOOKUP Subtype: input Result: ALLOW Config: Additional Information: in 0.0.0.0 0.0.0.0 outside Phase: 2 Type: ACCESS-LIST Subtype: Result: DROP Config: Implicit Rule Additional Information: Result: input-interface: inside input-status: up input-line-status: up output-interface: outside output-status: up output-line-status: up Action: drop Drop-reason: (acl-drop) Flow is denied by configured rule CASA5K-A(config)# ======================================================================== The access-group are as follows : access-group acl-inbound in interface outside access-group acl-outbound in interface inside and the access-list's are access-list acl-inbound extended permit tcp any any gt 1023 access-list acl-outbound extended permit ip object-group net-Source object net-dest

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  • I would like to pipe output of find into input list of scp, how?

    - by user13184
    I'm a novice linux user and I am trying to send a long list of files from one computer to another. The argument list is too long, so I am using find. I am having trouble setting up the expression, though. Can someone help? Here is what I would normally type for a short argument list. scp ./* phogan@computer/directory... Here's I think this might translate into with find. scp find . -name "*" phogan@computer/directory... Maybe I could use piping? Any suggestions would help. Thanks in advance.

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