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• How to rebuild fstab automatically

  - by yvoyer

  I accidentally removed all the entries from the fstab files while doing a backup (Yeah, I know ;)). I would like to know if there is a way to rebuild it with the current mount options, since I did not restart the server since the deletion. If there is no such program, could anybody help me rebuild it. Using this, I have found the command to show the current setup, but I don't know what to do with it. $ sudo blkid /dev/sda1: UUID="3fc55e0f-a9b3-4229-9e76-ca95b4825a40" TYPE="ext4" /dev/sda5: UUID="718e611d-b8a3-4f02-a0cc-b3025d8db54d" TYPE="swap" /dev/sdb1: LABEL="Files_Server_Int" UUID="02fc2eda-d9fb-47fb-9e60-5fe3073e5b55" TYPE="ext4" /dev/sdc1: UUID="41e60bc2-2c9c-4104-9649-6b513919df4a" TYPE="ext4" /dev/sdd1: LABEL="Expansion Drive" UUID="782042B920427E5E" TYPE="ntfs" $ cat /etc/mtab /dev/sda1 / ext4 rw,errors=remount-ro 0 0 proc /proc proc rw,noexec,nosuid,nodev 0 0 none /sys sysfs rw,noexec,nosuid,nodev 0 0 none /sys/fs/fuse/connections fusectl rw 0 0 none /sys/kernel/debug debugfs rw 0 0 none /sys/kernel/security securityfs rw 0 0 none /dev devtmpfs rw,mode=0755 0 0 none /dev/pts devpts rw,noexec,nosuid,gid=5,mode=0620 0 0 none /dev/shm tmpfs rw,nosuid,nodev 0 0 none /var/run tmpfs rw,nosuid,mode=0755 0 0 none /var/lock tmpfs rw,noexec,nosuid,nodev 0 0 none /lib/init/rw tmpfs rw,nosuid,mode=0755 0 0 none /var/lib/ureadahead/debugfs debugfs rw,relatime 0 0 /dev/sdc1 /home ext4 rw 0 0 /dev/sdb1 /media/Files_Server ext4 rw 0 0 binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc rw,noexec,nosuid,nodev 0 0 /dev/sdd1 /media/Expansion\040Drive fuseblk rw,nosuid,nodev,allow_other,blksize=4096,default_permissions 0 0 gvfs-fuse-daemon /home/yvoyer/.gvfs fuse.gvfs-fuse-daemon rw,nosuid,nodev,user=yvoyer 0 0 /dev/sdd1 /media/Backup500 fuseblk rw,nosuid,nodev,sync,allow_other,blksize=4096,default_permissions 0 0 /dev/sr0 /media/DIR-615 iso9660 ro,nosuid,nodev,uhelper=udisks,uid=1000,gid=1000,iocharset=utf8,mode=0400,dmode=0500 0 0 gvfs-fuse-daemon /home/cdrapeau/.gvfs fuse.gvfs-fuse-daemon rw,nosuid,nodev,user=cdrapeau 0 0

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• Help with "advanced" shell scripting | how to create an image preview of a pdf

  - by lucapozzobon

  First of all, sorry for my english: i'm not british/american. Here is my problem. I've got a folder named pdf with lots of files pdf inside it. I've got another folder named thumbnail, which is empty. I want to create jpg images preview of each pdf to use them in my HTML webpages as previews of the pdf. To do this I'm using a software called IMAGEMAGICK. I tried to put the code inside my PHP files to get the purpose, but it doesn't work. As you understood, I have created a small search engine with apache, mysql to search for pdf locally (offline). Now I want to add a "preview" of the first page of pdfs. Instead, it works by bash command line and the code is: convert pdf/name_of_the_file_pdf.pdf[0] name_of_the_imagefile.jpg (The zero stands for that the image is taken from the FIRST page of pdf) How can i make a script that takes each name of pdf files and put it into that code???? To list all the file, I did ls >pdf but with the little knowledge I have I can't go further.... Some pdf's names contain spaces....Is that a problem? PDF files are so many that i can't do the task typing every name,it wouldn't be a nice and clever work!!!! Thanks a lot in advance!!!

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• How do I install Ubuntu 12.04 PPC on a PowerPC G4 from commands line or fix the graphical mode?

  - by Gerardo Rodríguez

  Good afternoon. I'm new to this Linux world so I hope someone can help me . I recently got a Mac as a gift, a PowerPC G4 , which has 1GB of RAM but came with no optical drive or hard drive. So I put a dvd burner and a hard drive of 40 GB I got. Then download an iso of Ubuntu 12.04 for PowerPC and burned onto a CD. I'm trying to install from Open Firmware ( as I haven't a Mac keyboard, I use one standard ) . Finally, the Installation CD boots , but on live mode and after the Ubuntu 12.04 screen I get a message that there is a problem with my graphics adapter but I can continue with minimal graphics and give me the command line . My question is that how do I install through a text or if there is any way to fix this problem to run the graphical mode and so can continue the installation of Ubuntu, and if once installed Ubuntu the problem will be fixed or what? I would appreciate if you help me , as I mentioned before, there is almost nothing of Ubuntu but I think it will be easier than trying to get the Mac OS X proper . Spend good.

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• Launching php script through comman line - keeping terminal window open after execution

  - by somethis

  Oh, my girlfriend really likes it when I launch php scripts! There's something special about them, she says ... Thus, I coded this script to run throught the CLI (Command Line Interface) - so it's running locally, not on a web server. It launches just fine through right click open run in terminal but closes right after execution. **Is there a way to keep the terminal window open? Of course I can launch it through a terminal window - which would stay open - but I'm looking for a one click action. With bash scripts I use $SHELL but that didn't work (see code below). So far, the only thing I came up with is sleep(10); which gives me 10 seconds for my girl to check the output. I'd rather close the terminal window manually, though. #!/usr/bin/php -q <?php echo "Hello World \n"; # wait before closing terminal window sleep(10); # the following line doesn't work $SHELL; ?> (PHP 5.4.6-1ubuntu1.2 (cli) (built: Mar 11 2013 14:57:54) Copyright (c) 1997-2012 The PHP Group Zend Engine v2.4.0, Copyright (c) 1998-2012 Zend Technologies )

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• Why can't I run any Android NDK commands?

  - by TheBuzzSaw

  I had been running Mint 12 before, and everything was working there. I switched to Ubuntu 12.04, and now I am very frustrated. When I run ndk-build, I get /home/buzz/ndk/prebuilt/linux-x86/bin/make: not found So, I changed to that folder directly. When I type in ./make, I get bash: ./make: No such file or directory Typing ls clearly shows the file where I am! I did some hacking around (pointing to external tools) to get past each error (just to experiment), and I ran into this! /home/buzz/ndk/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/arm-linux-androideabi-gcc: Command not found Why? Why are all these files unable to be found? As I said above, this was all working just fine in another distro. What changed? What's extra frustrating is that if I push TAB to auto-complete, it works. So, the file is clearly there (and clearly marked with execution permissions). So, why can't it be found?

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• How do I stop color changes when quitting vi from a terminal emulator?

  - by Michael Warhol

  I have a problem with colors when using vi under Ubuntu 12.04. I'm connecting to my Ubuntu server from a PC, using PowerTerm terminal emulation software. I have PowerTerm set up to display black text on a grey background. When I connect to the Ubuntu box, the screen is fine. When I open a file with vi, the screen is fine. The text is black on a gray background, which is normal for my PowerTerm setup. However, if the file is less than a full screen long, the remainder of the screen is a black background. When I quit vi, the entire background turns black, and the text becomes white. I have to do a Terminal Reset to restore my normal text and background colors. What I want is for there to be no change at all when I use vi. The text should be black and the background grey. I have another server loaded with RedHat 9, and that acts normally; colors don’t change when using vi. Here is my .vimrc file: set compatible syntax off let g:loaded_matchparen=1 set nocp set noincsearch set nohlsearch set noshowmatch set bg=dark I've tried set bg=dark and set bg=light. It makes no difference. Is there some other set command that would clear this up for me, or some TERM setting (my TERM is set to linux)?

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• What packages are safe to uninstall to reduce installation size?

  - by mathematician1975

  This question is similar to a previous question I asked How can I turn my desktop Ubuntu 8.04 into a command line only install?. I was wondering if anyone can recommend any other bulky packages from the standard 8.04 installation that can reduce the size on disk of my installation. All I really require is socket functionality, g++ and gcc, some kind of text editor and SSH client and server. Things that I don't require are things like media players, audio packages, and the more "superficial" kind of desktop niceties. Is there anything particularly large in a standard install that is safe for me to remove without compromising my requirements above? I am a bit apprehensive about trying to uninstall items and I am not totally confident about removal of particular things having a negative effect on the functionality of any other things I might need (an example is would it be safe for me to remove everything to do with Perl, or does the system/kernel/other processes require this) ??? Basically I would like to be left with the kind of items that would have been installed in the CLI version of 8.04 (had the alternative iso image not been faulty). Any help/suggestions would be gratefully received.

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• Open a terminal window & run command, then close the terminal window if command completed successfully?

  - by Caspar

  I'm trying to write a script to do the following: Open a terminal window which runs a long running command (Ideally) move the terminal window to the top left corner of the screen using xdotool Close the terminal window only if the long running command exited with a zero return code To put it in Windows terms, I'd like to have the Linux equivalent of start cmd /c long_running_cmd if long_running_cmd succeeds, and do the equivalent of start cmd /k long_running_cmd if it fails. What I have so far is a script which starts xterm with a given command, and then moves the window as desired: #!/bin/bash # open a new terminal window in the background with the long running command xterm -e ~/bin/launcher.sh ./long_running_cmd & # move the terminal window (requires window process to be in background) sleep 1 xdotool search --name launcher.sh windowmove 0 0 And ~/bin/launcher.sh is intended to run whatever is passed as a command line argument to it: #!/bin/bash # execute command line arguments $@ But, I haven't been able to get the xterm window to close after long_running_cmd is done. I think something like xterm -e ~/bin/launcher.sh "./long_running_cmd && kill $PPID" & might be what I'm after, so that xterm is launched in the background and it runs ./long_running_cmd && kill $PPID. So the shell in the xterm window then runs the long running command and if it completes successfully, the parent process of the shell (i.e. the process owning the xterm window) is killed, thereby closing the xterm window. But, that doesn't work: nothing happens, so I suspect my quoting or escaping is incorrect, and I haven't been able to fix it. An alternate approach would be to get the PID of long_running_cmd, use wait to wait for it to finish, then kill the xterm window using kill $! (since $! refers to last task started in the background, which will be the xterm window). But I can't figure out a nice way to get the PID & exit value of long_running_cmd out of the shell running in the xterm window and into the shell which launched the xterm window (short of writing them to a file somewhere, which seems like it should be unnecessary?). What am I doing wrong, or is there an easier way to accomplish this?

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• edit commandline with $EDITOR in tcsh

  - by Nathan Fellman

  Today's Daily Vim says this: Assuming you're using the bash shell, the following can be helpful when composing long command lines. Start typing on the command line and then type Ctrl-x Ctrl-e, it should drop you into your system's default editor (hopefully Vim) and allow you to edit the command line from there. Once finished, save the command line, and bash will run the command. Is there any way to do this in tcsh?

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• WPF Commands firing via Keyboard shortcuts don't set the Command Parameter

  - by Aran Mulholland

  I have a command binding on the main form of my application. It is used to open details of the item that i am viewing. It has an associated keyboard shortcut. When i use the command in sub-forms i pass the object i want to open details for as a CommandParameter. This works if i attach the command to a button or a context menu, as i can specify the command parameter with a binding. However when the command is invoked as a result of a Keyboard shortcut i never get the chance to specify the parameter. How can i specify the command parameter at the sub-form level for a keyboard fired command. I need the CommandBinding with the CanExecute and Execute specified on the main form to globally handle all the open details events.

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• Fatal error encountered during command execution with a mySQL INSERT

  - by Brian

  I am trying to execute a INSERT statement on a mySQL DB in C#: MySqlConnection connection = new MySqlConnection("SERVER=" + _dbConnection + ";" + "DATABASE=" + _dbName + ";" + "PORT=" + _dbPort + ";" + "UID=" + _dbUsername + ";" + "PASSWORD=" + _dbPassword + ";"); MySqlDataAdapter adapter; DataSet dataset = new DataSet(); command = new MySqlCommand(); command.Connection = connection; command.CommandText = "INSERT INTO plugins (pluginName, enabled) VALUES (@plugin,@enabled)"; command.Parameters.AddWithValue("@name", "pluginName"); command.Parameters.AddWithValue("@enabled", false); adapter = new MySqlDataAdapter(command); adapter.Fill(dataset); The plugin table consists of two columns: pluginName(varchar(50)) and enabled(boolean). This fails with the error: mysql Fatal error encountered during command execution. Any ideas on why this would fail?

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• "Host key verification failed" error when transfering files using SCP command

  - by rvsi

  When I am trying to transfer files using SCP command I'm getting this error (Removed my IP and RSA key): @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Someone could be eavesdropping on you right now (man-in-the-middle attack)! It is also possible that the RSA host key has just been changed. The fingerprint for the RSA key sent by the remote host is ------------------------(RSA key) Please contact your system administrator. Add correct host key in /home/users/myaccount/.ssh/known_hosts to get rid of this message. Offending key in /home/users/myaccount/.ssh/known_hosts:4 RSA host key for 'my IP' has changed and you have requested strict checking. Host key verification failed. lost connection I am using newly installed Ubuntu 12.04 and I can connect to this server using ssh. Any help?

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• Visual Studio Talk Show #118 is now online - Command-Query Responsibility Separation (French)

  http://www.visualstudiotalkshow.com Erik Renaud: La sparation des responsabilits entre les commandes et les requtes Nous discutons avec Erik Renaud de la sparation des responsabilits entre les commandes et les requtes (Command-Query Responsibility Separation - CQRS). La plupart des applications lisent les donnes beaucoup plus frquemment qu'ils font des critures. Sur la base de cette dclaration, une bonne ide consiste sparer le code qui est responsable de lcriture des donnes du code qui est...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Visual Studio 2008 “Format Document/Selection” command and a function named “assert” in JavaScript c

  - by AGS777

  Just have found some funny behavior of the Visual Studio 2008 editor.  Sorry if it is already well known bug. If you happened to have a JavaScript function named “assert” in your code (and there is pretty high likelihood in my opinion), for example something like: function assert(x, message) { if (x) console.log(message); } then when either Format Document (Ctrl + K, Ctrl + D) or Format Selection (Ctrl + K, Ctrl + F) command is applied to the document/block containing the function, the result of the formatting will be: functionassert(x, message) { if (x) console.log(message); } That’s it. function and assert are now joined into one solid word. So be aware of the fact in case you suddenly start receiving  strange exception in your JavaScript code: missing ; before statement functionassert(x, message) And no, it is not an April Fool's joke. Just try for yourself.

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• Linux DD command partition -to- partition

  - by Ben Jackson

  I just used the DD command to copy the contents of one partition over to another partition on another drive, like this: dd if=/dev/sda2 of=/dev/sdb2 bs=4096 conv=noerror sda2 partition was 66GB and sdb2 was 250GB. I read that by doing this the extra space on the drive I am copying to will be wasted, is this true? I wasn't worried about loosing the extra space for the time being however, I just ran: sudo kill -USR1 (PID) to view the current status of DD and it has written over 66GB of data, will it continue to write data until it gets to 250GB? If so, is there a way to stop the process without corrupting it as waiting for it to write blank space seems like a waste of time.

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• Switch encoding of terminal with a command

  - by Tomas Lycken

  One of the servers I quite often ssh to uses western encoding instead of utf-8 (and there's no way I can change that). I've started writing a bash script to connect to this server, so I won't have to type out the entire address every time, but I would like to improve this script so it also changes the encoding of the terminal window correctly. The change I need to do can be performed using the mouse by navigating to "Terminal"-"Set Character Encoding..."-"Western (ISO-8859-1)". Is there a terminal command that does the same thing, for the current terminal window/screen? To clarify: I'm not interested in ways of switching the locale of the system on the remote site - that system is administered by someone else, and I have no idea what stuff might depend on the latin-1 encoding there. What I want to do is to let this terminal window on my side switch character encoding to the above mentioned, in the same way I can do with my mouse and the menus.

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• Jdk 6.0 update 6 installed sucessfully but java command not working

  - by Ravi.Kumar

  I switched to linux (Ubuntu 12.04) this morning and find it great but messed up while installing java. :-(. I have installed jdk6.0_6 successfully but when I run java command in terminal, I get this ravi@ravi-LIFEBOOK-AH531:~$ java The program 'java' can be found in the following packages: * default-jre * gcj-4.6-jre-headless * openjdk-6-jre-headless * gcj-4.5-jre-headless * openjdk-7-jre-headless Try: sudo apt-get install <selected package> Could someone help me with this? Below are the steps that I followed to install: copied file named jdk-6u6-linux-x64.bin to my documents from terminal executed chmod a+x jdk-6u6-linux-x64.bin and then executed sudo ./jdk-6u6-linux-x64.bin In terminal I accepted the license agreement and done.

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• How To Use Bash History to Improve Your Command-Line Productivity

  - by YatriTrivedi

  Whether you’re new to the Linux command-line or you’re a seasoned veteran, these tricks will help turn your text-based meanderings into full-blown marathons. Save time, speed up your productivity, and enhance your Linux-Fu, all at once! Latest Features How-To Geek ETC Learn To Adjust Contrast Like a Pro in Photoshop, GIMP, and Paint.NET Have You Ever Wondered How Your Operating System Got Its Name? Should You Delete Windows 7 Service Pack Backup Files to Save Space? What Can Super Mario Teach Us About Graphics Technology? Windows 7 Service Pack 1 is Released: But Should You Install It? How To Make Hundreds of Complex Photo Edits in Seconds With Photoshop Actions Super-Charge GIMP’s Image Editing Capabilities with G’MIC [Cross-Platform] Access and Manage Your Ubuntu One Account in Chrome and Iron Mouse Over YouTube Previews YouTube Videos in Chrome Watch a Machine Get Upgraded from MS-DOS to Windows 7 [Video] Bring the Whole Ubuntu Gang Home to Your Desktop with this Mascots Wallpaper Hack Apart a Highlighter to Create UV-Reactive Flowers [Science]

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• About grub rescue command line

  - by khai

  Please help me.. I have two hard disk in my laptop..window 7 and ubuntu.. I have problem to back in option menu..because i enter one of the list of ubuntu.. In option menu,,have a list which operatg system i can choose between ubuntu n window7 but the list stil have another menu for ubuntu..i make mistake to choose the another list of ubuntu..and now i have to fix the command line that have grub rescue.. like this : error : no such partition grub rescue > i dont have any idea to fix this problem..i try the another step that i see at the other question but still dont have any answer..this problem is just i enter the another list but do not have any kernel,problem or somethg like that..

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• Help me make a cronjob/screen command please?

  - by Josip Gòdly Zirdum

  Hi guys I want to set up a cronjob on reboot to do this cd /home/admin/vivalaminecraft.com && screen -d -m -S mcscreen && mono McMyAdmin.exe The issue is when I execute this it seems to create the screen but doesn't do the mono McMyAdmin.exe in the screen... Is there like a then command ? so it does 1. then 2. then 3. ? Could someone please help out :) So I tried this: so I did this: @reboot screen -dmS minecraft @reboot cd /home/admin/vivalaminecraft.com @reboot mono McMyAdmin.exe It still doesn't work. The screen is created but it doesn't have the mono execution in it I put this in it #!/bin/bash screen -dmS minecraft; cd /home/admin/vivalaminecraft.com; mono McMyAdmin.exe; is this correct?

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• PATH command not found

  - by joslinm

  Hi, I'm not experienced with PATH (Any good reference would be appreciated), but I made a mistake and did PATH=/google_appengine, which I'm assuming completely overrid PATH. Still, I restarted bash and echo'd PATH and found that the folders were back. mark@mark-laptop:~$ echo $PATH /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games However, when I then tried to append to it, I got an error that PATH wasn't found. I've looked around Google and couldn't find a good answer. Any help would be appreciated mark@mark-laptop:~$ PATH = $PATH:/google_appengine PATH: command not found

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• After executing a command in the terminal, I sometimes can't execute another

  - by jreed121

  First off sorry for the noob question, I'm sure it's been asked before but I have no idea how to phrase it eloquently... Sometimes when I open/run/execute (unsure of proper term) an application (?lol) from the terminal like geany ie: geany filename.php or maybe run a node.js script: node server.js The command will execute fine, but I'm then left without the ability to execute any other commands unless I open another terminal. my root@pcname:~$ is gone and when I try typing in something else and hitting Enter it just breaks to the next line. I've noticed that sometimes I can hit CTRL+D and it'll give me my prompt back (sorry is prompt even the right name for it?) So could someone please explain why this is happening and how I can get back to the prompt without opening another terminal. Thanks, and sorry again for my noobery.

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• Execure a random command from .txt file?

  - by Alberto Burgos

  I have a Ubuntu server, and I'm trying to print a Twitter quote using the app "twidge". So I made a list of tweets on a .txt file. I want to print one tweet (per line) from that file and send it to Twitter via twidge (or what ever other method was possible). I can print a random phrase with shuf: shuf -n 1 /var/www/tweets.txt and it works. It sends me back one of the tweets, but, it does not send it to Twitter, even if the "in line" phrase is a command. i.e: twidge update "bla bla bla" It just prints on the screen, but don't send it to Twitter. I tried turning the .txt to .sh, but don't work... any idea? by the way, i want to use it with crontab, something like this: 15 * * * * shuf -n 1 /var/www/tweets.txt

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• sudo: source: command not found

  - by HorusKol

  I've been updating some of the default profile for bash, and saw from the tutorials I was following that I could reload the new profile with the new environment settings by using: source /etc/bash.bashrc The only thing is - the new environment variables were only available to my current user - and were ignored when I used sudo. They only became available to sudo when I closed my terminal session and rejoined. When I try to use: sudo source /etc/bash.bashrc I get the error: sudo: source: command not found Is there a simple way to load in the new bash profile settings for sudo without having to close the terminal and restart?

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• Ubuntu 12.04 - after update it boots in command line only (no windows manager)

  - by ZSW

  I have Ubuntu 12.04, which has been working great for me since I installed it a year ago. Yesterday I ran the updates that update manager recommended. (Last time I ran updates before was about a week ago). After the updates were installed, it asked me to reboot. So I rebooted it, and then it stopped at login prompt (as a command line, with no windows). I logged in and tried to manually start the windows manager, and the screen went blank, and stayed blank I waited several minutes, and then turned it off. How can I figure out what is the problem? Which logs should I check?

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