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• Linux Program Source Management

  - by Blackninja543

  This particular problem has little do with SubVersion Repositories and more to do with the management of installed programs. My question revolves around the problem of installing a program from source. If I where to build a distro with no package management system what possibilities would I have for maintaining the program is up to date. My only idea would be to keep a record of all the programs installed from source and perform a periodic check to identify if a new version is out.

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• oddities in interference of linux extened ACLs and 'regular' permissions

  - by abbot

  I've got some legacy code which checks that some file is read-only and readable only by it's owner, i.e. permissions set to 0400. I also need to give read-only access to this file to some other user on the system. I'm trying to set extended ACLs, but this changes 'regular' permission bits in a strange way also: $ ls -l hostkey.pem -r-------- 1 root root 0 Jun 7 23:34 hostkey.pem $ setfacl -m user:apache:r hostkey.pem $ getfacl hostkey.pem # file: hostkey.pem # owner: root # group: root user::r-- user:apache:r-- group::--- mask::r-- other::--- $ ls -l hostkey.pem -r--r-----+ 1 root root 0 Jun 7 23:34 hostkey.pem And after this the legacy code starts complaining that the file is group-readable (while it is actually not!) Is it possible to set the extended ACLs in such a way that some other user will also have read-only access, while the file will appear to have only 0400 'regular' permissions?

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• How to allow users to transfer files to other users on linux

  - by Jon Bringhurst

  We have an environment of a few thousand users running applications on about 40 clusters ranging in size from 20 compute nodes to 98,000 compute nodes. Users on these systems generate massive files (sometimes 1PB) controlled by traditional unix permissions (ACLs usually aren't available or practical due to the specialized nature of the filesystem). We currently have a program called "give", which is a suid-root program that allows a user to "give" a file to another user when group permissions are insufficient. So, a user would type something like the following to give a file to another user: > give username-to-give-to filename-to-give ... The receiving user can then use a command called "take" (part of the give program) to receive the file: > take filename-to-receive The permissions of the file are then effectively transferred over to the receiving user. This program has been around for years and we'd like to revisit things from a security and functional point of view. Our current plan of action is to remove the bit rot in our current implementation of "give" and package it up as an open source app before we redeploy it into production. Does anyone have another method they use to transfer extremely large files between users when only traditional unix permissions are available?

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• Running $ORIGIN linked binaries from setuid scripts on linux

  - by drscroogemcduck

  I'm using suidperl to run some programs that require root permissions. however, the runtime linker won't expand library paths which contain $ORIGIN entries so the programs i want to run (jstack from java) won't run. more info here There is one exception to the advice to make heavy use of $ORIGIN. The runtime linker will not expand tokens like $ORIGIN for secure (setuid) applications. This should not be a problem in the vast majority of cases. my program looks something like this: #!/usr/bin/perl $ENV{PATH} = "/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/java/jdk1.6.0_12/bin:/root/bin"; $ENV{JAVA_HOME} = "/usr/java/jdk1.6.0_12"; open(FILE, '/var/run/kil.pid'); $pid = <FILE>; close(FILE); chomp($pid); if ($pid =~ /^(\d+)/) { $pid = $1; } else { die 'nopid'; } system( "/usr/java/jdk1.6.0_12/bin/jstack", "$pid"); is there any way to fork off a child process in a way so that the linker will work correctly.

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• linux/shell: change a file's modify timestamp relatively?

  - by index

  My Canon camera produces files like IMG_1234.JPG and MVI_1234.AVI. It also timestamps those files. Unfortunately during a trip to another timezone several cameras were used, one of which did not have the correct time zone set - meta data mess.. Now I would like to correct this (not EXIF, the file's "modify" timestamp on disk). Proposed algorithm: 1 read file's modify date 2 add delta, i.e. hhmmss (preferred: change timezone) 3 write new timestamp Unless someone knows a tool or a combination of tools that do the trick directly, maybe one could simplify the calculation using epoch time (seconds since ..) and whip up a shell script. Any help appreciated!

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• configuring linux console email client to check attachments

  - by Christopher

  I need to configure a IMAP4 capable (console-based) email client to - check and edit the name of an attachment ("contains umlauts?" - change character ä to ae) - delete emails that don't fit certain requirements (not PDF, DOC,... not from domain xyz.com) Whether the client can do everything by itself or can just trigger a script on incoming mail doesn't matter. Anyone have an idea with mail client would be suitable for such a task?

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• Running a Linux virtual machine on Windows 7

  - by hekevintran

  I want to do two things: Set up a virtual machine on Windows 7 to run Ubuntu Set up a way for the virtual machine to read the windows disk or windows to have read/write access to the virtual machine's disk. My goal is to have a place where both Ubuntu and Windows can read and write. What software is good for this task? Are their free programs that can run virtual machines? Also if my machine is running Windows 7 64-bit, can I install Ubuntu 32-bit? Or am I forced to use Ubuntu 64-bit? Or does it not matter?

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• Linux how to force quit the process by root

  - by Mirage

  I have run the command to backup 7 accounts and then i want to quit that command while its running. How can i quit from command line I want that it should quit backing up all accounts not just current account and then i have to press again untill all accounts open

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• Deleting large no of files on linux eats up CPU

  - by Sanjay

  I generate more than 50GB of cache files on my RHEL server (and typical file size is 200kb so no of files is huge). When I try to delete these files it takes 8-10 hours. However, the bigger issue is that the system load goes to critical for these 8-10 hours. Is there anyway where I can keep the system load under control during the deletion. I tried using nice -n19 rm -rf * but that doesn't help in system load.

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• "Slave" user accounts in GNU/Linux

  - by Vi

  How to make one user account to be like root for some other user account, e.g. to be able to read, write, chmod all it's files, chown from this account to master and back, kill/ptrace all it's processes and to all thinks root can, but limited only to that particular slave account? Now I'm simulating this by allowing "master" user to "sudo -u slaveuser" and setting setfacl -dRm u:masteruser:rwx ~slaveuser. It is useful as I run most desktop programs in separate user accounts, but need to move files between them sometimes. If it requires some simple kernel patch it is OK.

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• Linux Cups raspberry pi offload processing to server

  - by jaredmsaul

  I am interested in setting up a raspberry pi as the local end of a printing solution. In my testing the pi chokes on acting as a complete cups based print server. It seems a little underpowered for some of the ghostscipt processing and other filtering that occurs-- particularly on larger or complex documents the processing time can be 5 or more minutes. My question is can the processing be largely done elsewhere and the prepared end product of the processing chain be fed to the pi for output on the connected printer? So in this scenario any arbitrary document (html, pdf, text) is initially 'printed' on a relatively powerful machine but the output is stored in a file. This file is then grabbed by the pi and with all the heavy work out of the way easily printed using cups. I know files can be pushed through cups in raw mode but I am fuzzy on the pros and cons and the applicability in what I describe. I have tested this with pdftops creating a ps file then feeding that raw to cups and I think it works but it seems like there may be a cleaner solution. This scenario would ideally work for any number of printer types.

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• Full screen not available in vmplayer 6 (on Linux)

  - by Simon

  I recently updated vmware player from 5.0.2 to 6.0.0, and now the "full screen" menu item is always grayed out. It happens with all my VMs, regardless of the guest OS. "Enter Unity" is still available for some reason. When I edit a VM to start up in full screen it works, but once I leave full screen I can't go back, which is really annoying. I've no clue where to start looking for the cause. I'm seeing this on Ubuntu 13.04 and OpenSUSE 12.3.

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• Debugging Connection Issues Between Two Linux Servers

  - by clickfault

  I have two CentOS 5 servers running iptables and apf. I am having issues connecting with ssh from server 1 to server 2. I can connect from server 1 to a third server and from that third server to both 1 and 2. In all cases I am using the IP address and not a host name. I have stopped iptables and apf on all servers and it doesn't seem to change anything. What is the best way to debug this process?

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• Ubuntu Linux: Process swap memory and memory usage

  - by David Halter

  My Ubuntu eats more memory than the task manager is showing: sudo ps -e --format rss | awk 'BEGIN{c=0} {c+=$1} END{print c/1024}' 1043.84 free -m total used free shared buffers cached Mem: 3860 1878 1982 0 20 679 -/+ buffers/cache: 1178 2681 Swap: 2729 1035 1693 That's strange. Can someone explain this difference? But what is more important: I'd like to know how much memory a process is really using. I don't want to know the virtual memory size, but rather the resident memory plus swap of a process. I have also tried to output the format param "sz" of 'ps', but the sum of this is to high (5450 MB) (param 'size' gives 8323.45 MB). Are there any other options? I really want to use this, to determine which programs/processes are eating to much memory (and swap), to kill them, because hibernate might not be working if the swap partition is to little.

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• linux worker script/queue (php) [closed]

  - by xetrill

  Hi, I need a binary/script (php) that does the following. Start n process of X in the background and maintain the number processes. An example: - n = 50 - initially 50 processes are started - a process exits - 49 are still running - so 1 should be started again. Please, this is urgent. Thanks! Michael

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• Too Many Files In Debian Linux Folder?

  - by Dave Potts

  I've been using an external USB drive on a Debian server for backup. The drive is formatted as NTFS and mounted with ntsfmount. This was working fine, but I was filling up a directory with lots of files. Eventually the backup failed. When I then tried to look at the directory using ls it reported: ls: reading directory .: Numerical result out of range Looking in syslog, I also saw this: Sep 23 07:35:31 tosh ntfsmount[28040]: Failed to read index block: Numerical result out of range. Is this simply that I've reached the upper limit of number of files in a directory? If so, is there any way to extend the number of allowed files?

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• Wired to wireless bridge in Linux

  - by adrianmcmenamin

  I am attempting to set up my Raspberry Pi as a bridge (but I think this is not a question specific to the hardware) - using Debian wheezy. I have a hostapd.conf: (some details changed for security)... interface=wlan0 bridge=br0 driver=nl80211 auth_algs=1 macaddr_acl=0 ignore_broadcast_ssid=0 logger_syslog=-1 logger_syslog_level=0 hw_mode=g ssid=MY_SSID channel=11 wep_default_key=0 wep_key0=MY_KEY wpa=0 (yes, I know WEP is no good) And this in /etc/network/interfaces auto lo iface lo inet loopback iface eth0 inet dhcp allow-hotplug wlan0 iface wlan0 inet manual wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf iface default inet dhcp auto br0 iface br0 inet dhcp bridge-ports eth0 wlan0 Everything seems to come up ok, but I cannot associate with the bridged wireless connection - even though the flashing lights on the USB stick suggest packets are being exchanged. I have read somewhere that not all cards/devices will run in hostap mode - they won't pass packets in one direction: is that right? (The info was a bit old)- this my card: [ 3.663245] usb 1-1.3.1: new high-speed USB device number 5 using dwc_otg [ 3.794187] usb 1-1.3.1: New USB device found, idVendor=0cf3, idProduct=9271 [ 3.804321] usb 1-1.3.1: New USB device strings: Mfr=16, Product=32, SerialNumber=48 [ 3.816994] usb 1-1.3.1: Product: USB2.0 WLAN [ 3.823790] usb 1-1.3.1: Manufacturer: ATHEROS [ 3.830645] usb 1-1.3.1: SerialNumber: 12345 So, what have I got wrong here?

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• Routing using Linux with 2 NIC cards

  - by Kevin Parker

  Configured Clear OS to be in Gateway mode on a machine with two NIC cards. eth0:192.168.2.0/24 with ip 192.168.2.27 which is connected to a modem and thus have internet connectivity. eth1:192.168.122.0/24 with ip 192.168.122.10 which is connected to other machines in LAN through switch. LAN machines with network 192.168.122.0 is not getting internet.How can they get internet Through Clear OS gateway.I have enabled packet forwarding in clear os using "ip_forward=1" What am i missing?.Can you please help me in this. Following are the static routing i have added: on LAN machine1 with ip address 192.168.122.11 ip route add 192.168.2.0/24 via 192.168.122.10 dev eth0 ip route show 192.168.2.0/24 via 192.168.122.10 dev eth0 192.168.122.0/24 dev eth0 proto kernel scope link src 192.168.122.11 But still 192.168.2.0/24 network is not reachable.Where can be the problem??

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• Copy data from a remote Linux box to my Windows desktop

  - by Sanjay Rao

  I use Putty to login to the remote server and then set the environment and change the path to a particular directory. Now from this dir, I need to copy a folder to my desktop which is Windows? How can I achieve this ? Some of my failed attempts are as follows scp -r remote_foldername srao@my_ipaddress:C:\srao\Users\Desktop So from the remote server which is to be copied through putty, to my_username_in_windows@ip_address:path to destination

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• Upgrading PHP 5.1 to 5.3 on Linux Server

  - by nicorellius

  I trying to find the best way to upgrade from PHP 5.1 to 5.3. The CRM software I am running on this server requires this upgrade or else I probably wouldn't even perform it, because it seems like it's going to be perhaps trickier than I hoped it would be. Being still new to the programming world, these routine upgrades are still worrisome to me. I am running apache 2.2.6 (Fedora), PHP 5.1.6 and MySQL 5.0.27 on this server.

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• Linux SCP defining destination port

  - by Webnet

  How can I specify a port for the destination ip? When I do scp -p 0000 it still tries to connect on port 22, not the one I'm specifying. scp svn_backup.tgz [email protected]:/path/to/new/svn/

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• Write permissions on uploaded files - Linux, Apache, PHP

  - by letseatfood

  I am working on a PHP script that transfers files using FTP functions. It has always worked on my production server (which is a hosting service). The development server I have just setup (I am a novice to servers) is Debian Lenny with Apache2, PHP5, and MySQL5. The file transfer works correctly, but once the file has been written to the server, it has permissions of 600. This makes it impossible for me to view the file (JPEG) in the web browser, as permission is denied. I have scoured the internet and even broken my server installation and reinstalled it trying to figure this out (which has been fun, nonetheless!). I know it is unwise to set 777 permissions on public accessible files, but even that will not solve the problem. The only thing that works is if I chmod 777 thefile.jpg after it has been transferred, which is not a working solution. I tried changing the owner of my site files to www-data per this post, but that also does not work. My user is mike, and it still does not work whether the owner of the files is mike or root. Would somebody point me in the right direction? Thanks! And, of course, let me know if I can clarify anything.

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• Run Jar in Background on Linux

  - by Benny

  I have a jar that runs forever (infinite loop with socket listening thread) and need it to run in the background at all times. An example would be: "java -jar test.jar" How do I do this? Thanks in advance!

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• One handed Dvorak on Linux/X11

  - by Jeffrey Aylesworth

  I can change to standard dvorak by running setxkbmap dvorak, how do I change to right handed Dvorak, is there a new keymap I need to download?

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• Configure linux machine as bridge/switch and end device

  - by leemes

  At my home, I have two desktop PCs in two rooms. The router / DSL modem is in one of these rooms. Now I want to configure a home server (having 2 LAN ports, running 24/7) in the corridor between the two rooms, using only one LAN cable at each door. This gives me the following physical configuration: (door) (door) .----/-/----. .-----/-/----------._ FritzBox | | | .----´´ DSL Router PC1 Server | PC2 As just said, the server has 2 network interfaces and is running Ubuntu. What I need now is a network configuration which enables both the server and PC1 to connect to the router. I think the server needs to serve as a bridge or switch. Currently, all computers are configured having static IP addresses. If I'm understanding it correctly, a bridge / switch doesn't have its own IP address, but as the server needs to be configured as an own end device, it needs to have one. My first question is, do I have to configure both interfaces separately, giving both the same static IP address? My next question is, how do I bridge the two physical networks into one? I have basic understanding (but am always confused again and again) of bridges and switches, but I don't know how to configure it in software. I only know that it's possible to do so :) The third question is: Is it possible to configure this in a way that network packets from/to PC1 to/from the router only go through hardware or only consume low CPU in the server? Can you help me? Thanks in advance!

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