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• Encrypt tar file asymmetrically

  - by DerMike

  I want to achieve something like tar -c directory | openssl foo > encrypted_tarfile.dat I need the openssl tool to use public key encryption. I found an earlier question about symmetric encryption at the command promt (sic!), which does not suffice. I did take a look in the openssl(1) man page and only found symmetric encryption. Does openssl really not support asymmetric encryption? Basically many users are supposed to create their encrypted tar files and store them in a central location, but only few are allowed to read them.

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• SSH reverse tunnel to monitor and manage remote devices

  - by acid_crucifix

  I have a set a distributed set of devices running Ubuntu 12.04 that I am distributing to clients. I would like to manage them remotely. They may not have fixed IPs and potentially might be behind firewalls. What I am planning to do is have the devices (permanently connected to the net) poll a request URL and based on the response open a reverse tunnel to my server, so that I can access them via that tunnel. Most of what I read about reverse tunnel over SSH is for single use cases and very little about heavy production usage. Is there some reason for this, security issues? or stability? Any help would be much obliged.

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• Looking for a "light" compositing manager for GNOME

  - by detly

  I have an HP Pavilion DM3 (graphics is nVidia GeForce G105M), running Debian Squeeze with GNOME 2.30. My preference for DE is Gnome + Metacity + Nautilus. I'd like to use Docky, but it requires compositing. So I'm looking for a relatively "light" compositing manager. I realise that "light" is ambiguous, but I basically want something that won't chew through my notebook's batteries because of CPU or GPU usage. I know that Metacity is capable of compositing, but as far as I'm aware it's still testing. Some people report that it's smooth and lightweight, others claim that it eats up processor time. I've also seen references to a problem with nVidia, but no actual details. I'm not averse to Compiz, but I haven't used it before and I don't know what to expect in terms of "weight." And maybe there's something else I haven't heard of. So can anyone recommend anything? Or dispel my idea that Metacity is not the right tool for the job? (Originally posted on GNOME forums.)

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• `rsync` NEVER uses its 'famous' delta-transfer!

  - by o_O Tync

  I have a big iso image which is currently being downloaded by a torrent client with space-reservation turned on: that means, file size is not changing while some chunks in in (4 Mib) are constantly changing because of a download. At 90% download I do the initial rsync to save time later: $ rsync -Ph DVD.iso /some/target/ sending incremental file list DVD.iso 2.60G 100% 40.23MB/s 0:01:01 (xfer#1, to-check=0/1) sent 2.60G bytes received 73 bytes 34.59M bytes/sec total size is 2.60G speedup is 1.00 Then, when the file's fully downloaded, I rsync again: total size is 2.60G speedup is 1.00 Speedup=1 says delta-transfer was not used, although 90% of the file has not changed. Why?!

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• How to determine if a file has been backed up?

  - by Console

  I try to consolidate old drives to new ones of larger capacity. Sometimes files have been renamed, but are otherwise identical. Sometimes an old directory has just a few more files in it than a newer directory with the same name. Sometimes a file has the same name but the size differs. So I often find myself asking the question: Are there any files on this old drive or directory that I haven't already copied to the new drive? I just want to know that I have the files, I don't want to try and sync stuff automatically (Syncing tools tend to just sync, creating duplicate folder structures and other problems, so I prefer to do it by hand). Basically, if an old drive has a file called "foo.bar" ten directories deep, and my new big drive has an identical file called "oldstuff.zip" in the root, I just want a "yes you have it" or "no, unique files exist". Is there a free tool, a script or a quick and easy method (Mac/Unix or Windows) to get the answer?

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• How to set TV-out options under Linux of an Geforce 9600 GT video card

  - by polemon

  I'm using the TV-out connector of my Geforce 9600 GT to connect it to an old TV set. It's obviously in Composite mode, the other two cables of Component video are dead, only Pb/VIDEO labeled one gives me a signal. The picture appears black/white on the TV, I presume it's because the video card gives me an NTSC signal, but it's a PAL tv set. How do I change the TV-out from NTSC to PAL? My Component to SCART adapter hasn't arrived yet, but I think I should be able to set manually, whether the signal should be Composite or Component. How do I switch modes of the TV-out, between Component and Composite? I'm running Linux, so it's probably some settings I need to make in xorg.conf. Edit: I got this far: I need to set in the "Device" section of my xorg.conf: Option "TVStandard" "PAL-B" Option "TVOutFormat" "COMPOSITE" The whole section looks like this now: Section "Device" Identifier "Device0" Driver "nvidia" VendorName "NVIDIA Corporation" BoardName "GeForce 9600 GT" Option "AddARGBGLXVisuals" "True" Option "TVStandard" "PAL-B" Option "TVOutFormat" "COMPOSITE" EndSection How can I list all available settings for "TVStandard" and "TVOutFormat"?

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• How can one associate a 3ware controller with the corresponding /dev/tw?? device?

  - by barbaz

  I have a few 3ware RAID controllers installed in a system. Is there any way to figure out the mapping between the following identifiers, each describing in a way the very same RAID controller? The tw_cli reported controller id (e.g. c0,c1,c2,...) The corresponding device nodes that allow smartctl access via the 3ware driver (e.g. /dev/twa0, /dev/twa1, /dev/twl0) The block device presented to the system representing a RAID unit (/dev/sda, /dev/sdb,...)

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• Getting rid of GNU Emacs's menu bar in terminal windows

  - by Ernest A

  How to get rid of Emacs's menu bar in terminal windows? The standard answer is to put (when (not (display-graphic-p)) (menu-bar-mode -1)) in init.el. However, this solution is not good, because all it does is remove the menu bar after the fact. You can still see it for a split second. It's very annoying. Looking at the source code in startup.el I don't see an obvious solution to this problem. I think the only way is to use before-init-hook. Maybe this could do the trick? (add-hook 'before-init-hook (lambda () (setq emacs-basic-display t))) But this hook is run before init.el and other init files are evaluated, so how is one supposed to use it?

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• Ubuntu 9.04 Cannot Connect to visible open wifi ap (reason 6)

  - by Andrew Bolster

  I'm travelling currently so the last network i connected successfully to was my home wpa-psk network. I hadn't tried anything until i got to my accommodation that is an open network (that I'm on now on the Win7 partition on my laptop). The network (and a similar archetypical 'linksys' open network, aswell as some protected local networks are correctly displayed in network-manager and upon selection, it happily spins around to its hearts content for a while before saying 'no chance boy'. /var/log/syslog spills out the usual combination of wpa_supplicant and kernel messages, the most interesting of are that the kernel deauthentication reason 6 response. 6 apparently means class2FrameFromNonAuthStation...Client attempted to transfer data before it was authenticated. Anyone seen anything like this? I've already tried going closer to the router to no avail. I don't remember seeing this any other time I've connected to a open AP, even if that AP is far away. (Signal strength for this AP is good, kismet says its around -57dBm, well above the threshold of -80dBm, and I've tried all the suggestions from the 'Related Questions'

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• Run scp as ubuntu@ copying to Ubuntu system with correct permissions?

  - by Heinrich Schmetterling

  I ssh into a ubuntu box with username "ubuntu" and I can become root without entering a password via "sudo su". How can I scp files onto this box using the ubuntu@ username? It does not allow me to do so using root@. The error is: scp: /etc/...: Permission denied I can do this same task in rsync by using --rsync-path="sudo rsync" for example.

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• How to bulk-rename files with invalid encoding or bulk-replace invalid encoded characters?

  - by qdoe

  I have a debian server and I'm hosting music for an internet radio station. I have trouble with file names and paths because a lot of files got an invalid encoding, for example: ./music/Bändname - Some Title - additional Info/B?ndname - 07 - This Title Is Cörtain, The EncÃ?ding Not.mp3 Ideally, I would like to remove everything that is not letters A-Z/a-z or numbers 0-9 or dash -/underscore _... The result should look like something like that: ./music/Bndname-SomeTitle-additionalInfo/Bndname-07-ThisTitleIsCrtain,TheEnc?dingNot.mp3 How to achieve this for a batch of a lot of files and directories? I've seen this similar question: bulk rename (or correctly display) files with special characters But this only fixes the encoding, I would prefer a more strict approach as described above.

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• Execute encrypted files but don't let anybody read them.

  - by Stebi

  I want to provide a virtual machine image with an installed web application. The user should be able to boot the vm (don't login, just boot) and a webserver should start automatically. The point is I want to hide the (ruby) source code of the web application from everyone as there is no obfuscator for ruby. I thought I could use file system encryption to encrypt the directory with the sourcecode (or even a whole partition). But the webserver user must be able to read it automatically after booting. Nobody is allowed to login as the webserver user (or any other user) so no other can read the contents. My questions are now: Is this possible? Because I give away the whole vm everybody could mount its virtual discs and read them (except the encrypted one). Is it now possible to find the key the webserver user needs to decrypt the files and decrypt them manually? Or is it safe to give such a vm away? The problem is that everything needed to decrypt must be included somewhere in the vm else the webserver cannot start automatically. Maybe I'm completely wrong and you have another tip for me securing the source code.

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• Minix3 on Vmware

  Hi, I install minix3 on vmware using installation CD i make using .iso image which is available @minix3 I make 2GB Harddisk, 512MB RAM on VMware, and installed step-by-step. It got installed and working fine. But i wana install 'packman' which is X window system. I'm not able to install it. It asks for installation CD, its still there and its detected also, but i couldn't proceed. Actually i install minix to learn Operating system design and Implementation :) Have any1 tried installing 'packman' i.e X window system on minix3. Please guide me. :)

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• How can I register a custom protocol with xdg?

  - by julien

  I've been struggling this morning trying to associate an application with a custom protocol, namely emacsclient and org-protocol. I'm calling this protocol from a webbrowser bookmarklet, and I get the following behaviour : In chromium, the "Launch Application" dialog comes up, and calls xdg-open org-protocol://... which ends up firing a new chromium frame. In firefox, I've tried setting network.protocol-handler.app.org-protocol to an empty string or my emacsclient path, anyhow I get the following error message : "Firefox doesn't know how to open this address, because the protocol (org-protocol) isn't associated with any program" without even showing any external application selection dialog. I'm not using any desktop environment, so I need to make this work strictly with xdg, however, despite reading the shared mime info spec etc, I still can't fathom a working configuration.

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• What are the minimum required modules to run WordPress

  - by Mister IT Guru

  Recently a 'consultant' came in to talk to bean counters at my place of employment, with regards to being more efficient with our IT infrastructure. They suggested to be more efficient we should only load the Apache modules that are required on our web servers. (This is just 1 of 1Ks of suggestions). The Bean Counters are very excited, and prepared for me to spend the time to investigate this avenue of cost cutting. I don't mind this mundane exercise, I see it as a learning experience! I guess this leads me to the actual question: How can I determine the minimum required apache modules for a PHP based application without actually going through the code, or plain old trial and error?

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• My DNS works! But, what is the simplest way to add something to it?

  - by Alex

  This is my current DNS example.com.db zone file. I followed a tutorial. It works, because when I point to this DNS from another server via resolve.conf, it will actually forward me to the right IP when I do "ping example.com". ; ; BIND data file for example.com ; $TTL 604800 @ IN SOA example.com. info.example.com. ( 2007011501 ; Serial 7200 ; Refresh 120 ; Retry 2419200 ; Expire 604800) ; Default TTL ; @ IN NS ns1.example.com. @ IN NS ns2.example.com. example.com. IN MX 10 mail.example.com. example.com. IN A 192.168.254.1 www IN CNAME example.com. mail IN A 192.168.254.1 ftp IN CNAME example.com. example.com. IN TXT "v=spf1 ip4:192.168.254.1 a mx ~all" mail IN TXT "v=spf1 a -all" Right now, ping example.com....goes to 192.168.254.1. That's great!!! it works! My question is--how can I add something do this file so that when my other servers: ping dbserver1....goes to 44.245.66.222 ping cacheserver1 ....goes to 38.221.44.555 I want to use it like a universal hosts file for my machines.

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• USB forwarding from dom0 to domU

  - by Karolis T.

  What are my options to forward two USB connected phones to xen guest? I've read about PCI-passthrough http://www.wlug.org.nz/XenPciPassthrough, but I'm sure usb controller in the server isn't a pci card. There's device level forwarding, but I need to forward two devices, this here doesn't say how to do it: http://www.olivetalks.com/2008/02/03/usb-forwarding-on-xen-it-just-does-not-work/ Would something as simple as: usbdevice = [ 'host:xxx', 'host:yyy', ] work? EDIT: I'm now starting a bounty. This is really important for me and for other people also, hoping someone who have this resolved will be able to help.

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• Xorg: How can I map AltGr to the CapsLock Key (to toggle 3rd level symbols)

  - by basweber

  Hi, as many others I don't need Capslock. I want to reassign it to have the function of AltGr. I use Kubuntu 9.10 but I think there must be a solution which is distribution independent. I already tried to use setxkbmap or xmodmap. Using xmodmap at least I managed that the CapsLock key to behaves like the Delete key by following this description. But I could not achieve assigning the AltGr behavior to CapsLock.

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• Why grep -i is so slow? How to do it faster for ASCII?

  - by Vi.

  $ time lzop -d < tvtropes-index.lzo | egrep -B 5 '[Dd][eE][sS][cC][eE][nN][dD] ?[Ff][rR][oO][mM]' real 0m0.438s $ time lzop -d < tvtropes-index.lzo | egrep -B 5 'descend ?from' -i real 0m11.294s Both search insensitively. why -i so slow? How to make fast grep -i without entering things [iI][nN] [tT][hH][iI][sS] [wW][aA][Yy]? For example, perl -ne 'print if /descend ?from/i' works fast, but '-B 5' is not as trivial to implement as in grep (as well as other options).

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• How do I make a Minecraft kiosk for portable USB drive that boots on most computers

  - by user2044589

  Some time ago, someone referred me to a cool website called Rapid Rollout. It worked fine until I tried to install an OS onto a netbook. To put it short, it didn't work as well as I expected it to. It also didn't install USB flash drives. I'm trying to build a system (or use a service that would create a system) that would open up the Minecraft Launcher (jar) and show it in full-screen with no background. It would also all have to fit into 8 Gigabytes (as this is the most that I can use right now). How can I accomplish this?

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• How to keep source frame rate with mencoder/ffmpeg?

  - by Sandra

  I would like to crop and rotate a video, and then encode it to mp4 or mkv. mencoder video.mp4 -vf rotate=1,crop=720:1280:0:0 -oac pcm -ovc x264 -x264encopts preset=veryslow:tune=film:crf=15:frameref=15:fast_pskip=0:threads=auto -lavfopts format=matroska -o test.mkv But when I do the above encoding, the frame rate is way too fast. The encoding options were something I found, so I don't know if that is the problem. Question All I want is to crop and rotate the video, and keep the audio/video quality as good as possible. Have anyone tried this?

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• Can qmail-ldap replace the validrcptto file?

  - by T. Fabre

  We are using qmail to route incoming mail to our Domino server. However, that requires us to maintain the validrcptto with the list of all allowed email addresses. Since Domino provides an LDAP directory, does qmail-ldap provide functionnality to lookup valid rcpt to addresses in the Domino directory instead of the validrcptto file, so that we wouldn't have to maintain that extra list ? We have about 150~200 users, so is setting up qmail-ldap worth the extra mile if it can verify addresses in the LDAP directory ? If anyone has experience with qmail-ldap and its setup, I'd be glad to hear from you.

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• Ubuntu12.04 - launched applications, not staying in same desktop

  - by Anders Metnik

  My question is why a launched application, if it has loading time like netbeans, eclipse jdeveloper etc. If i go to desktop3 and launch an application and then go to desktop 2 while I wait, then when it has loaded the application will launch in desktop2. Is there anyway to change this? I find it highly annoying since i on startup would like to launch 3-4 big applications, leave my computer while loadingf, and then return. But i cant leave since i have to launch them sequential instead of simultaneous... Help please :-)

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• Server not responding to SSH and HTTP but ping works

  - by yes123

  Hello guys, I requested an hard reboot because none of ssh and http worked. Ping worked normally. Which logs should i check to understand what was the problem? Thanks! (debian 6 on lamp) Edit: my memory and swap: Mem: 4040068k total, 1114920k used, 2925148k free, 109212k buffers Swap: 1051384k total, 0k used, 1051384k free, 283820k cached 4 GB ram (and more than 1TB of HDD) The cause is from 2 days ago: look how the usage of swap goes +60% in less than 10hours My control panel reports this as top 5 memory usage process: If every apache2 process is 190MB large that sux because IF i do TOP i have 262 sleeping process most of them are apache2! My apache mpm_prefork settings are: <IfModule mpm_prefork_module> StartServers 5 MinSpareServers 5 MaxSpareServers 10 ServerLimit 1500 MaxClients 1500 MaxRequestsPerChild 2000 </IfModule> KeepAlive On MaxKeepAliveRequests 100 KeepAliveTimeout 4

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• Can not understand this script

  - by Jim

  Can someone help me understand this script? It is from sysconf_add and I am new to scripting. I need to do something similar. function add_word() { local word=$1 local word_quoted=$2 if ! word_present; then $debug && cp $file $tmpf sed -i -e "${lineno} { s/^[[:space:]]*\($var=\".*\)\(\".*\)/\1 $word_quoted\2/; s/=\" /=\"/ }" $file $debug && diff -u $tmpf $file else echo \"$word\" already present fi # some balancing for vim"s syntax highlighting }

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