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• Concatenating several .mp3 files into one .mp3

  - by Bakhtiyor

  As it was suggested here I am using cat command to concatenate several .mp3 files into one .mp3 file. Imagine, I have following .mp3 files in the current folder: 001001.mp3 001002.mp3 001003.mp3 001004.mp3 001005.mp3 or, like this: 096001.mp3 096002.mp3 096003.mp3 096004.mp3 I need to concatenate these .mp3 files in there ascending sequence, i.e. 001001.mp3+001002.mp3+001003.mp3+etc. In order to join these .mp3 files into one I am executing following command in the current folder: cat *.mp3 > final.mp3 I tested the final .mp3 file and it is what I am expected, but I need to be sure that above command picks files in there ascending sequence. Can I be sure that above command always concatenates files in the ascending sequence? Thank you Sir!

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• How can I run sudo gedit as gksu gedit

  - by SimplySimon

  I'm looking into ways of automatically loading Gedit as gksu gedit when I enter sudo gedit by mistake? I have found that I have made a number of files unreachable by using gedit and I have only just found out why! ACHIEVED SO FAR I have written a script which will make an alias so that if I type in sudo <application> it can automatically convert that to gksu <application> but I want to make this alias stick, so that I don't have to run the script every time I boot the computer. Is there a config file I can edit or should I run this script as a start up script (which would be inconvenient!)?

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• disable all hotkeys with dconf-editor

  - by Gijs

  I'm building a deb package that will create a kiosk user account. When you login to this account, the browser automatically starts and navigates to a pre-given website. Also all the hotkeys should be disabled except for one you defined. Now I'm at the part that the browser starts and my disable script is excecuted on logon but for exaple, I can still close the browser with Alt + F4. And when i check the dconf-editor for the hotkeys, for every single one the bind is deleted, but mine for close isn't added. Like you can see in the printscreen. I disabled all these keys with this code, one line for evere hotkey gsettings set org.gnome.desktop.wm.keybindings begin-resize [] So this seams to work, but at the bottom of my disable script this line should be executed. gsettings set org.gnome.desktop.wm.keybindings close ['<Alt>b'] Does anyone know why i'm able to unbind all these hotkeys in my dconf-editor but they are able to still do their job? And when it is possible to unbind them, why cant I bind mine? I searched the web for a solution but couldn't find one fitting my needs, I hope some of you know the answer to this. Regards Gijs

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• How to create scripts that create another scripts

  - by sfrj

  I am writing an script that needs to generate another script that will be used to shutdown an appserver... This is how my code looks like: echo "STEP 8: CREATE STOP SCRIPT" stopScriptContent="echo \"STOPING GLASSFISH PLEASE WAIT...\"\n cd glassfish4/bin\n chmod +x asadmin\n ./asadmin stop-domain\n #In order to work it is required that the original folder of glassfish don't contain already any #project, otherwise, there will be a conflict\n" ${stopScriptContent} > stop.sh chmod +x stop.sh But it is not being created correctly, this is how the output stop.sh looks like: "STOPING GLASSFISH PLEASE WAIT..."\n cd glassfish4/bin\n chmod +x asadmin\n ./asadmin stop-domain\n #In order to work it is required that the original folder of glassfish don't contain already any #project, otherwise, there will be a conflict\n As you see, lots of things are wrong: there is no echo command is taking the \n literaly so there is no new line My doubts are: What is the correct way of making an .sh script create another .sh script. What do you thing I am doing wrong?

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• how to rename files with count

  - by nkint

  i have a directory like this: randomized_quad015.png randomized_quad030.png randomized_quad045.png randomized_quad060.png randomized_quad075.png randomized_quad090.png randomized_quad1005.png randomized_quad1020.png randomized_quad1035.png randomized_quad1050.png randomized_quad105.png randomized_quad1065.png randomized_quad1080.png randomized_quad1095.png randomized_quad1110.png randomized_quad1125.png randomized_quad1140.png and i want to rename the first files adding 0 in front of number, like: randomized_quad0015.png but i don't know how.. some help?

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• what is wrong with this easy script

  - by alex

  what is wrong with this easy script? I just want to write an script which change my directory: A. I put below commands on the file witch its name is pathABC on the /home/alex directory, #!/bin/sh cd /home/alex/Documents/A/B/C echo HelloWorld B. also I did chmod +x pathABC , On the terminal when I am on the /home/alex directory, I run ./pathABC . But the output is just HelloWorld and the current directory remains with no change. I mean my directory remains as /home/alex and not go to the /home/alex/Documents/A/B/C. So where is wrong?

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• How to open a file or folder from Terminal

  - by Victor Hugo Souza

  I'd like to know if there is a way to open a file or a folder from terminal? When I wrote a URL LINK in terminal, it's allows me to open that link on my default browser. So I'd like to do the same with my files and folders. I know that there is a way via cli using gnome-open or xdg-open, but I'd like a solution that use mouse by clicking on the path or the url. Eg. When I write "pwd" the path allows me to click and open on Nautilus It's the inverse of what "nautilus-open-terminal" does.

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• how to concatenate two strings in shell script in 3.13.0-34-generic kernel

  - by saikrishna

  I want to concatenate two strings for the shell file im getting error when i have created the shell file in following manner could you please suggest how to get it set export APP_HOME="/home/sfptladmin/ArchivalDaemon" export JAVA_HOME="/usr/lib/jvm/java-7-oracle/jre" export LIBPATH="/home/sfptladmin/ArchivalDaemon/lib" export CPATH=$APP_HOME/conf export CPATH=$CPATH:$LIBPATH/commons-beanutils-core-1.7.0.jar export CPATH=$CPATH:$LIBPATH/commons-collections-3.2.jar export CPATH=$CPATH:$LIBPATH/commons-io-1.4.jar export CPATH=$CPATH:$LIBPATH/commons-lang.jar export CPATH=$CPATH:$LIBPATH/commons-net.jar export CPATH=$CPATH:$LIBPATH/dataloader-27.0.1-uber.jar export CPATH=$CPATH:$LIBPATH/dom4j-1.6.1.jar export CPATH=$CPATH:$LIBPATH/log4j-1.2.15.jar export CPATH=$CPATH:$LIBPATH/opencsv2.3.jar export CPATH=$CPATH:$LIBPATH/poi-3.7.jar export CPATH=$CPATH:$LIBPATH/poi-ooxml-3.7.jar export CPATH=$CPATH:$LIBPATH/poi-ooxml-schemas-3.7.jar export CPATH=$CPATH:$LIBPATH/wsc-23-min.jar export CPATH=$CPATH:$LIBPATH/xmlbeans-2.5.0.jar export CPATH=$CPATH:$LIBPATH/archival-daemon-main.jar export CPATH=$CPATH:$LIBPATH/sbmclasspath.jar export CPATH=$CPATH java -Xms256m -Xmx512m -classpath $CPATH "-Dfile.encoding=UTF-8" com.genpact.proflow.daemon.archival.manager.ArchivalManager echo $CPATH

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• Pgagent startup script (under the postgres user)

  - by Dominique Guardiola

  Hello, I'm trying to make a clean startup script for pgagent I found one here but I don't see how I can change this : if start-stop-daemon --start --quiet --pidfile /var/run/pgagent.pid \ --exec /usr/bin/pgagent "hostaddr=127.0.0.1 dbname=postgres user=postgres \ password=XXXXXXX";then to launch something like this : su - postgres -c /usr/bin/pgagent "hostaddr=127.0.0.1 dbname=postgres user=postgres" in order to avoid to hard-code the PG password in the script. This is possible using the .pgpass file feature. It works when I'm logged under the postgres user. So my only problem left is how to launch this command under the postgres user tried to add --user=postgres in the call, like mentioned here but it does not work.

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• How do I rebuild a corrupt dpkg status file?

  - by Ramón

  Whenever I type sudo apt-get remove and then press the Tab key for auto-completion I get the following message: grep-status: /var/lib/dpkg/status:15945: expected a colon. I don't see anything especially strange at line 15945 in the status file. It's a dot character in the description field of a mono library package and inserting a colon did not help. Removing the line containing the dot did not work either. Overwriting the file with status-old resulted in the same message. Is there some way to rebuild the status file?

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• alias of nodejs as node on 14.04

  - by Koka

  i installed nodejs with apt-get on 14.04 When i do nodejs -v v0.10.25 and when i do node -v node : command not found. So i want to make alias of nodejs as node So i inserted a line in ~/.bashrc alias node=nodejs Now i can access the nodejs with node on terminal. But in my project, i use grunt which fires nodemon via gruntfile.js. Now nodemon tries to run node instead of nodejs Now again i get the same problem node : command not found. Means alias was not made for non-interactive shell non-login shell. Where should i make the alias for this specific purpose and get my problem solved?

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• How to find a Window which should be visible on Ubuntu 14.04

  - by Bernard

  In Ubuntu 14.04 I have Keepass2 in my Launchbar. I do execute Keepass and I can see it is executing by a small arrow. With statement : ps - fu bernard | grep keepass2 Also with alt-tab I see Keepass. If I click on the Keepass icon still I am not switched to Keepass. The same happened to me with XAMPP from https://www.apachefriends.org so it seems a general Ubuntu 14.04 problem I execute this in Virtualbox client. If I switch sometimes to other VB client, when I come back the Windows is visible.

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• Script to email files content

  - by Tarun

  I have created a shell script that takes backups everyday and emails its execution as successfull or unsuccessfull. Now I want that it send the contents of log file it creates with the mail as well. I have seen how to send file as attachement but I want to send the contents of the file as email message and not the file. Please Help. Its code is like #Email Settings Message_Success="Database Backup generated successfully" Message_Failure="Problem occured while generating Database Backup please verify" Subject="Database Backup Status Mail" Recipients="[email protected]" #Verify Backup Created if [ -f "$Path_Mysql_Dump" ]; then echo "Database Backup Created" >> $Path_Log_File echo "$Message_Success" | mail -s "$Subject" "$Recipients" else echo "Database Backup not created please verify the process will terminate" >> $Path_Log_File echo "$Message_Failure" | mail -s "$Subject" "$Recipients" exit -1 fi

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• Library missing for executable file

  - by user1610406

  There's an executable I downloaded onto my Ubuntu 10.04 and I can't run because it's missing a library. I have also tried compiling the source with CMake. This is my Terminal output: zack@zack-laptop:~/Desktop$ ./MultiMC ./MultiMC: error while loading shared libraries: libssl.so.1.0.0: cannot open shared object file: No such file or directory I think I need libssl 1.0 to run this file, but I'm not sure. Any help?

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• Undertanding .bashrc and .bash_profile

  - by Blankman

  On a server when I login as root I see .bashrc (ubuntu 10.10). On my Mac I have a .bash_profile, does ubuntu always have only a .bashrc file and not .bash_profile? (just confused so asking, I realize they are different o/s's but maybe there is a relationship somehow?) On my server, I want to create an alias, should I put it in .bashrc? What if I want this alias to be applied so all users can use it?

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• what could cause a script to fail to find python when it has `#!/usr/bin/env python` in the first line?

  - by jcollum

  Trying to get casperjs running on Ubuntu 12.04. After installing it when I run I get: 09:20 $ ll /usr/local/bin/casperjs lrwxrwxrwx 1 root root 26 Nov 6 16:49 /usr/local/bin/casperjs -> /opt/casperjs/bin/casperjs 09:20 $ /usr/bin/env python --version Python 2.7.3 09:20 $ cat /opt/casperjs/bin/casperjs | head -4 #!/usr/bin/env python import os import sys 09:20 $ casperjs : No such file or directory 09: 22 $ python Python 2.7.3 (default, Sep 26 2013, 20:03:06) [GCC 4.6.3] on linux2 So Python is present and runnable, casperjs is pointing to the right place and it is a python script. But when I run it I get "No such file". I can fix it by changing the first line of the casperjs python file from: #!/usr/bin/env python to: #!/usr/bin/python Result: $ casperjs --version 1.1.0-DEV I managed to fix it, but I'm wondering why it didn't work with #!/usr/bin/env python, since that seems to be a normal interpreter line. Do I have something configured wrong? Here are the steps to get casperjs: $ git clone git://github.com/n1k0/casperjs.git $ cd casperjs $ ln -sf `pwd`/bin/casperjs /usr/local/bin/casperjs $ casperjs : No such file or directory

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• How to check the process is already running or not

  - by TechGuru

  I want to check the particular process in already running or not. I refereed this Q&A. But I didn't get any specific solution. Following is the example that I tried: I have created abc.sh file and run this script on background, like sh abc.sh &. Now this file is running on background and I fire the ps aux | grep "abc" command. Following is the output of this command: prakash 3594 0.0 0.0 4388 820 pts/0 S+ 16:44 0:00 grep --color=auto abc After that I stop the abc.sh running script and fire the same command ps aux | grep "abc" command. But I am getting same output like: prakash 3594 0.0 0.0 4388 820 pts/0 S+ 16:44 0:00 grep --color=auto abc Is there any other way to find the process is running or not?

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• Learning the command line [duplicate]

  - by Billy

  This question already has an answer here: What is the best way to learn how to use Ubuntu with terminal? 3 answers This isn't really a technical question but I am curious as to how long it takes to learn the linux command line. I would like to learn how to be able to do as much as possible easily from the command line. I just bought a book, linux command line and shell scripting bible. I know that this book will be of great help, but i just have no clue how long it will be before i can successfully naviagte the terminal with ease. If you could post and let me know about your experience with the terminal, and the learning process, that would be greatly appreciated. Thank you in advance.

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• Recursively rename files - oneliner preferably

  - by zetah

  I found this answer how do i... but it simply doesn't work - it did not rename any file for unknown to me reason Before I started to search around I thought that it should be easy task even for novice penguin, but it doesn't seem so for me. For example, I simply can't tell ls to list all *.txt in all subfolders, which was surprise to me (without grep or similar). Then I found find and find . -name name_1.txt lists files fine, but for f in $(find . -name name_1.txt) ; do echo "$f" ; done splits whole file paths with space as separator, so it's unusable to pass that output to some command like mv or rename I want to ask whats wrong with above command and if possible some nifty oneliner so I can recursively rename name_1.txt to name_2.txt

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• How to find history of shell commands since machine was created?

  - by Edward Tanguay

  I created an Ubuntu virtualbox machine a couple weeks ago and have been working on projects off and on in it since then. Now I would like to find the syntax of some commands I typed in the terminal a week ago, but I have opened and closed the terminal window and restarted the machine numerous times. How can I get the history command to go back to the first command I typed after I created the machine, or is there another place that all the commands are stored in Ubuntu?

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• Function inside .profile results in no log-in

  - by bioShark

  I've created a custom function in my .profile, and I've added right at the bottom, after my custom aliases : # custom functions function eclipse-gtk { cd ~/development/eclipse-juno ./eclipse_wb.sh & cd - } The function starts a custom version of my eclipse. After I've added it, because I didn't wanted to log-out/log-in, I've reloaded my profile with the command: . ~/.profile and then I've tested my function by calling eclipse-gtk and it worked without any issue. Today when I booted, I couldn't log in. After providing my password, in a few seconds I was back at the log-in screen. Dropping to command line using CTR + ALT + F1, I've commented out the function in my .profile and the log-in was possible without any issue. My question is, what did I do wrong when I wrote the function? And if there is something wrong, why did it work yesterday after reloading the profile. Thanks in advance. Using: Ubuntu 12.04

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• How do I cancel a time-delayed screenshot?

  - by coversnail

  I'm using the default screenshot application that comes with Ubuntu gnome-screenshot When I was using it earlier to take screenshots of the lock screen I had set a long time delay, but forgot to change it back after I'd finished. When I next took a timed screenshot I had to wait a long time for it to take because the delay was still set so long. Clicking the icon to relaunch the screenshot application has no effect whilst the timer is in effect, I imagine there is probably a simple terminal command to shut down an application, but I don't know it! Is there a way to do this?

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• gnome-terminal and logging

  - by UAdapter

  Is there any way to log every that was displayed in gnome-terminal? for example I have a complex command doSomethingThatPrintoutsAlot ; doSomethingThatPrintoutsAlot2 ; doSomethingThatPrintoutsAlot3 I can add > file, but than I would have to do it for each command and I have to use tail in another console to see the output. maybe gnome-terminal support logging everything? there is .bash_history, so .... it might also support this.

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• Add "not" to if statement in shell script

  - by John Crawford

  I have the following script that should exist if the user does not exist. #check if user currently exists on system if id $User > /dev/null 2>&1 then #user exists no need to exit program echo "blah blah, what a waste of space" else echo "This user does NOT exists. Please create that user before using this script.\n" exit fi My problem is that I would ideally like to place a "not" if that first if statement so that I can trim down my if, else statement. Ideally I would like something like this: if !(id $User > /dev/null 2>&1) then echo "This user does NOT exists. Please create that user before using this script.\n" exit fi

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• How do I sort by human readable sizes numerically?

  - by UAdapter

  for example I have command that shows how much space folder takes du folder | sort -n it works great, however I would like to have human readable form du -h folder however if I do that than I cannot sort it as numeric. How to join du folder and du -h folder to see output sorted as du folder, but with first column from du -h folder P.S. this is just an example. this technique might be very useful for me (if its possible)

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