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• How can I use my laptop's monitor as my PC's ONLY monitor? [closed]

  - by Randell

  Possible Duplicate: Can I use my laptop as a second monitor for my desk computer? My PC's monitor just died and I'm not looking at buying a new monitor anytime soon. So I'm thinking of using my laptop's monitor for it. Both machines are running on Fedora linux. Edit: Both machines are connected to the same wireless network. PC needs to log in before it can connect to the network if I'm not mistaken. Update: This is different from Can I use my laptop as a second monitor for my desk computer? , because that question is asking how to use the laptop screen as the secondary display, not as the only display.

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• Can I create an SSH user which can access only certain directory?

  - by RiMMER

  I have a Virtual Private Server which I can connect to using SSH with my root account, being able to execute any linux command and access all the disk area, obviously. I would like to create another user account, which would be able to access this server using SSH too, but only to a certain directory, for example /var/www/example.com/ For example, imagine this user has a HUGE error.log file (500 MB) located in /var/www/example.com/logs/error.log When accessing this file using FTP, this user needs to download 500 MB to view the last lines of the log, but I'd like him to be able to execute something like this: tail error.log Therefore I need him to be able to access the server using SSH, but I don't want to grant him access to all server areas. How can I do this?

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• How do I install php-gd?

  - by user42577

  I've done phpinfo() to see if it was installed but I see no mention of the gd libraries anywhere. I ran this command (rpm -qa | grep php) and this is what I see: php-gd-4.3.9-3.18.1.swsoft php-mysql-4.3.9-3.18.1.swsoft php-pgsql-4.3.9-3.18.1.swsoft php-4.3.9-3.18.1.swsoft php-domxml-4.3.9-3.18.1.swsoft php-imap-4.3.9-3.18.1.swsoft php-mbstring-4.3.9-3.18.1.swsoft php-ncurses-4.3.9-3.18.1.swsoft php-pear-4.3.9-3.18.1.swsoft php-snmp-4.3.9-3.18.1.swsoft php-devel-4.3.9-3.18.1.swsoft php-ldap-4.3.9-3.18.1.swsoft php-odbc-4.3.9-3.18.1.swsoft php-xmlrpc-4.3.9-3.18.1.swsoft My server is a linux box with php5 installed. I also tried to run yum install php5-gd to no avail.What else should I do or check to get it installed?

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• FTP issue - VSFTPd and connecting to from FileZilla

  - by B Tyndall

  I'm trying to connect to a CentOS Linux box that I have hosted on EC2 and I think I have everything configured correctly but when I try to connect I get this series of messages Status: Connection established, waiting for welcome message... Response: 220 (vsFTPd 2.0.5) Command: USER tyndall Response: 331 Please specify the password. Command: PASS ********* Response: 230 Login successful. Status: Connected Status: Retrieving directory listing... Command: PWD Response: 257 "/home/tyndall" Command: TYPE I Response: 200 Switching to Binary mode. Command: PASV Error: Connection timed out Error: Failed to retrieve directory listing Not sure where to start troubleshooting this issue. Any ideas? Do I need to change any permissions? I would think this ID has the ability to see my own home directory. I am able to push/pull files from the command line version of FTP client working on Windows.

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• 8-bit game creator software

  - by dag729

  Hi, Anyone knows about some 8-bit game creator software that runs under GNU/Linux? I want to make some funny game in my spare time, but I prefer to have a tool (or a set of tools) that will help to keep it just a spare-time-project, thus not involving programming! :D Thanks in advance EDIT: For instance, some month ago I tried FPS Creator, being a frontend of DarkGame Studio. Well, FPS Creator is for a 3D FPS game: what I meant is a software similar to this one, but concening 8-bit'ish game.

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• Making TT-RSS cache images

  - by Piku

  Due to Google Reader's untimely demise, I've installed tiny-tiny RSS on my Linux machine under Apache 2. It's mostly a good enough replacement and I can at least go back to reading RSS feeds in my web browser at work. Can I configure or hack TT-RSS to cache all the images it finds in its feeds? There is an option when adding a feed, but it doesn't seem to actually do anything. If I view (for example) today's XKCD comic in TT-RSS it still loads the image from the XKCD website. What I want is the image to be cached in TT-RSS and served from there instead.

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• Automatically updating routing table on server

  - by bramp

  I have a LAN with three routers on it, one connected to the Internet, one VPN router connected to a few remote sites, and a final route connected to a private network (using BGP to get prefix advertisements). On the same LAN I have multiple Linux servers which needs access to the networks behind each router. I have achieved this by configuring static routes on the server, pointing the different network prefixes to the correct router. This has worked well, but every time we connect to a new remote VPN, we have to change all the servers to be aware that the network is now accessible via the VPN, and not via the default Internet route. What I want is a way to automatically update the routes on all of the servers, when the route is added to a routers. Now, I could install Quagga or something similar on all the servers to receive router advertisements, but that seems like overkill. So my question is what is the easiest/simpliest way to update the routing tables on the server automatically, and what protocol is best suited for this purpose. thanks

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• How to share files between cPanel accounts?

  - by Darren

  I am setting up a multi-site/multi-store Magento installation, and I want each site to have its own cPanel account so I can setup the SSL and dedicated IP properly. I have tried to create a linux group called 'magento' and changed the files I need to share to that group (even added the users to that group), however when I try to access files through my scripts on those accounts it doesn't acknowledge the files exist. I first made a soft symbolic link which didn't work and then including them to their real location but it didn't work. Am I missing a step in allowing which users can access which files? I added the users to the magento group and like I said changed the group of the files I need to share to them but it's still not working. Thanks, Darren

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• Limit disk I/O one program creates?

  - by Posipiet

  Hardware: one virtualization server. Dual Nehalem, 24GB RAM, 2 TB mirrored HD. Software: Debian, KVM, virt-manager on the server with several virtual machines that use Linux too. 2 TB Disk is a big LVM, each VM gets a logical volume and makes its own partitions in that. Problem: One of the programs that runs on one of the VMs creates huge disk load. This never was an issue, because the program never ran on such a powerful hardware. Now the CPUs are fast, and lots of I/O is the result. We cant do much against that at the moment, because the tool is a black box. On the other hand, the speedy computation is welcome. The program creates about 5 GB of temp files which get overwritten during the next iteration. Question: How can we limit the disk I/O for the process?

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• Dummy HTTP server for debugging

  - by Andrea

  This is more or less the inverse of my previous question. I need to debug some HTTP requests that I am making. Since these requests arise from the use of some external libraries, sometimes I am not sure of what is the actual data I am sending. Is there some dummy server (for Linux) that accepts HTTP requests and just prints them somewhere so that I can inspect them? I would like to be able to see in plain text the full request, like POST /foo HTTP/1.1 Host: www.example.com Accept: text/xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5 Accept-Language: en-gb,en;q=0.5 Content-Type: text/plain Content-Length: 11 Hello world

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• setting nproc in /etc/security/limit.conf prevents ssh login

  - by omry

  I am trying to use /etc/security/limit.conf on Linux (Debian) to limit the number of processes per user. for starters, I tried to limit my own user processes by adding this to /etc/security/limit.conf: omry hard nproc 100 this locked my user out of ssh. I could open new processes (verified with su omry), but could not log into ssh with that user : sshd reported this in it's log: fatal: setreuid 1000: Resource temporarily unavailable also, I am certain my user is not running anything near 100 processes (actually 6). what can be the reason for this?

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• How to automatically show USB camera or memory stick contents in Icewm?

  - by darenw

  I normally use a very lightweight Linux setup. No desktop like Gnome or KDE, just Icewm as the windows manager and nothing else that normal users might consider essential. Well, I do need a file manager - I use Thunar. Recently I've been trying Gnome. Whenever I shove a memory stick into a USB port, or connect my digital camera, it can automatically pop up a file manager showing all the goodies on that device. KDE does this too. I like this. Although quick at the command line, I like not having to go sudo to mount the device and all that. If I want to stick with a lightweight setup using Icewm+Thunar, is there something non-huge I can install to make external devices fire up a Thunar window, or otherwise make access to the contents brainlessly easy?

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• Is there a way to determine the original size or file count of a 7-zip archive?

  - by Zac B

  I know that when I compress an archive with the 7za utility, it gives me stats like the number of files processed and the amount of bytes processed (the original size of the data). Is it possible, using the commandline (on linux) or some programming language, to determine: the original size of an archive, before it was compressed? the number of files/directories contained within an archive? The answer might be "no, just decompress the whole archive and do counting/sizing then", but it would be useful to know if there was a faster/less space-greedy way.

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• How to increase max FD limit for a daemon process running under a headless user?

  - by Ameliorator

  To increase the FD limit for a daemon process running under a headless user on a Ubuntu Linux machine we did following changes in /etc/security/limits.conf soft nofile 10000 hard nofile 10000 We also added session required pam_limits.so in /etc/pam.d/login. The changes got reflected for all the users who logged out and logged in again. Whatever new processes are starting under those users are getting new FD limits. But for the daemon which is running under a headless user the changes are not getting reflected. what is the way by which the changes can be reflected for the daemon which is running under headless user ?

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• Remove Audio stream from XVID files

  - by Kyle Brandt

  I have a bunch of Xvid files that each have an audio stream that I do not want. How can I strip the audio track I don't want using the Linux command line? I don't need the whole script (loop), just what command I would use to process each avi file individually (unless the cmd itself has batch modification built into it). I don't believe the file is in an mkv container, as mkvinfo doesn't find anything. Here is part of mplayer's output (thanks ~quack): [aviheader] Video stream found, -vid 0 ID_AUDIO_ID=1 [aviheader] Audio stream found, -aid 1 ID_AUDIO_ID=2 [aviheader] Audio stream found, -aid 2 VIDEO: [XVID] 512x384 12bpp 25.000 fps 1013.4 kbps (123.7 kbyte/s)

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• Computer freezes for 2+ seconds, mouse still moves

  - by xsaero00

  I have this problem on my workstation. The computer would effectively freeze for 2-5 seconds for no apparent reason, then continue as normal. While frozen the mouse would still be movable, but only on one of screens in my multi-screen setup. What can be the likely cause. System: CPU: i7-920 Memory: 12G of Patriot DDR3, 6 modules OS: SLED 11, Suse Linux Enterprise Desktop, using Gnome Main board: Asus P6T Video: two Nvidia 9500GT connected to three displays I am using memory at recommended settings of 8-8-8-1333. It has an XMP profile. Th CPU is a bit overclocked to 3.3 GHz, but my cooling more than allows for it. I ran the computer with all overclocks off and lower memory speed but the issue was still there. Any ideas? Where should I start looking?

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• ipfw to redirect traffic from port 80 and 443 to 8080

  - by user1048138

  -A PREROUTING -s 10.0.10.0/24 -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 8080 -A PREROUTING -s 10.0.10.0/24 -p tcp -m tcp --dport 443 -j REDIRECT --to-ports 8080 -A POSTROUTING -s 10.0.10.0/24 -o eth0 -j MASQUERADE The above code is what I have used on linux to forward my ports to 8080, how can I do the same on a mac? I have tried test_machine:~ root# ipfw show 00666 0 0 fwd 127.0.0.1,8080 tcp from any to me dst-port 80 and its not working! any suggestions?

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• Distributed, Parallel, Fault-tolerant File System

  - by Eddified

  There are so many choices that it's hard to know where to start. My requirements are these: Runs on Linux Most of the files will be between 5-9 MB in size. There will also be a significant number of small-ish jpgs (100px x 100px). All of the files need to be available over http. Redundancy -- ideally it would provide the space efficiency similar to RAID 5 of 75% (in RAID 5 this would be calculated thus: with 4 identical disks, 25% of the space is used for parity = 75% efficent) Must support several petabytes of data scalable runs on commodity hardware In addition, I look for these qualities, though they are not "requirements": Stable, mature file system Lots of momentum and support etc I would like some input as to which file system works best for the given requirements. Some people at my organization are leaning towards MogileFS, but I'm not convinced of the stability and momentum of that project. GlusterFS and Lustre, based on my limited research, appear to be better supported... Thoughts?

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• information about /proc/pid/sched

  - by redeye

  Not sure this is the right place for this question, but here goes: I'm trying to make some sense of the /proc/pid/sched and /proc/pid/task/tid/sched files for a highly threaded server process, however I was not able to find a good explanation of how to interpret this file ( just a few bits here: http://knol.google.com/k/linux-performance-tuning-and-measurement# ) . I assume this entry in procfs is related to newer versions of the kernel that run with the CFS scheduler? CentOS distro running on a 2.6.24.7-149.el5rt kernel version with preempt rt patch. Any thoughts?

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• How do I unmount a tmpfs that is missing from /etc/mtab?

  - by vrinek

  I have the following line in /etc/fstab: none /home/hydra/tmp tmpfs user,noauto,size=1000M,uid=1001,gid=1001 0 0 I can do mount ~/tmp as user hydra and it gets mounted ok. The only problem is that even thought it gets added to /proc/mounts, it does not get added to /etc/mtab. When I try a umount ~/tmp (again as hydra) it complains: umount: /home/hydra/tmp is not mounted (according to mtab) And when I try -f or -n, it complains that I am not root. Some more info on the system that manifests this problem: On sudo umount /home/hydra/tmp, the fs gets unmounted (I think I needed to used -f too) Debian version is testing mount --version - mount from util-linux 2.19.1 (with libblkid and selinux support) ls -l /etc/mtab - -rw-r--r-- 1 root root 921 Nov 14 09:08 /etc/mtab cat /proc/mounts | grep rootfs - rootfs / rootfs rw 0 0 /home, /home/hydra nor /home/hydra/tmp are symbolic links

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• Convert color photos of documents to good black-and-white images?

  - by Norman Ramsey

  Since I don't have a copier or scanner, I'm using an 8 megapixel camera to copy documents. This works pretty well except they need a lot of processing afterward. I'd like to get from a photo to a bitmap, but using djpeg -grayscale -pnm photo.jpg | pgmtopbm -threshold -value XXX does not work so well, for two reasons: It's hard to guess what XXX should be, and XXX is different for different photos. Illumination varies, and sometimes a single threshold isn't what's right for the image. How can I do better? The ideal solution will be fully automatic command-line program that I can run on Linux. (I have already written a program to remove dark pixels from the edges of images.)

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• Sending UDP/514 data magically appears in syslog without rsyslog running

  - by ale

  I’m using a programming language without a library to log to rsyslog over UDP. I thought I was going to need to write a library but I discovered something weird. If I send data on UDP/514 with the port open on the server then the data appears in the server’s syslog. rsyslogd isn’t running so syslog isn’t doing this. Data doesn’t get formatted into a syslog message so rsyslogd really isn’t doing this (only raw text enters syslog). Linux must see the data coming in on this port and know that it should go into /var/log/messages? If I do the same on another port (e.g. UDP/515) then nothing appears in the log! What is doing this? Some CentOS feature? The kernel?

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• Reverse bash console text flow

  - by radman

  Hi, This is a bit of a weird question and I'm not sure that there is any easy answer to it but I am very interested in finding a solution. So when I work on a linux machine via a console I find that I am constantly staring at the bottom of the screen, as once you have executed a bunch of commands text fills toward the bottom. Now I find that this is decidedly not good for my neck and it would be far better if instead of scrolling to the bottom, the text would scroll to the top instead. So does anyone out there know if there is a way to reverse the direction text appears in a console? (note that i am aware of the clear command) Example: default behaviour user@machine:~$ command 1 user@machine:~$ command 2 user@machine:~$ command 3 user@machine:~$ __active_prompt__ desired behaviour user@machine:~$ __active_prompt__ user@machine:~$ command 3 user@machine:~$ command 2 user@machine:~$ command 1 Running Kubuntu 10.04 using Konsole I realise this is an odd question, thanks for any help.

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• MySQL Daemon failed to start

  - by T. Brian Jones

  THE SETUP I'm running Linux CentOS on an Amazon EC2 instance. The MySQL data files are on an EBS Drive mounted at /data/ ( symlink - /var/lib/mysql /data/mysql ). Everything works fine in this setup. THE PROBLEM I'm trying to move everything from this EBS drive to a new drive. I umounted the /data/ drive, and mounted it at /data2/. Then I mounted the new drive at /data/ and copied everything over to it from /data2/. Everything on the system works great, except MySQL. Every time I try to start the MySQL daemon ( /etc/init.d/mysqld start ) I get a MySQL Daemon failed to start error.

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• Is it possible to convert striped logical volume to linear logical volume?

  - by JooMing

  I've a logical volume that is striped across three physical volumes. I had to move this logical volume to another physical volume. This worked nicely with pvmove command. However, I discovered later that the logical volume is still striped and now all three stripes are on the same physical volume. Is there any way to convert striped logical volumes to linear logical volumes? I'm using LVM2 on linux. I figured that the obvious possibility is to rename the striped logical volume, create a new linear logical volume, and then copy data over, but that requires taking the filesystem system offline for some time. Unfortunately, I can't do that before the next week. Is there any better alternative?

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