Bash is the shell used in Ubuntu's command-line interface.

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MySQL Crontab Check

I have a serverpilot.io server running from digitalocean (1gb Ram), MySQL will crash once a week, the stats say the server is using ~256 mb out of 1 gb, but mysql will crash saying out of memory.... ...
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2answers
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How to set JAVA_HOME for all users for “elasticsearch” program?

I'm trying to set JAVA_HOME for elasticsearch but no luck till now. I tried to set it in .bashrc, etc/environment, etc/.profile all fail. this is the command I use to run elasticsearch: sudo ...
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1answer
18 views

Bash Script to search a webpage

I've Googled my problem, and it's getting more confusing. I want to write a bash script that will search this page for a specific string and echo if it's found. For example, if I wanted to search ...
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2answers
162 views

How can I discover where apt-get has installed applications?

I have installed 2 development tools named maven and ant using this command: sudo apt-get install maven ant How can I discover what are the installation directories for these tools on my system?
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1answer
20 views

How to set a permanent environment variable?

I am not yet a Linux guy and I have some problem trying to add a new permanent environment variable. So I have to set a new environment variable named CATALINA_HOME with this value: ...
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21 views

Rotate binary files

I'm trying to solve a problem with rotating binary files. I have video files which are recorded from IP camera, and I want to delete oldest files when I have less then e.g. 10 Gb of free space. ...
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9 views

Automatically switch to Singstar Microphones when they're plugged in

I am running a media computer for my sharehouse and since singstar has been so popular I want to run Ultrastar for everyone too. The problem is that getting the microphones set up can be finicky and ...
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30 views

Script for Opening Two Terminals and Execute Three Consecutive Commands [duplicate]

I intent to open two terminals and execute three consecutive commands in bash script. Basically, the first terminal will execute first command, second terminal will execute second command, and back ...
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3answers
27 views

Use of the Rename Command

I have a two part question. I have a series of files with the names "file.pdb.#", where # is an integer. 1.) How can I script to rename all the "file.pdb.#" to "file_#.pdb", where the integer is ...
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28 views

Different results of 'ps aux | grep x' if entered manually and done via script

It was probably a bad method, but I was running ps aux | grep x | wc -l as part of the if statement in a script. When I ran this from the command line as a regular user, the result would be 1 if the ...
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17 views

Sorry, user is not allowed to execute X as root on lt

Whenever I try to run a command from the termainal as sudo, I am now getting the error: Sorry, user {user} is not allowed to execute {command} as root on lt. lt is the name of my computer. The only ...
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33 views

What is wrong with my code so far? [on hold]

I'm attempting to make a DNA translation script in bash that will take an input file, iterate through the file, and convert every three characters into the proper protein code it corresponds to. Thus ...
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1answer
31 views

How can I be sure “apt-get install” successfully finished its work?

I have Ubuntu 14.04 and I intend to download Skyrim. So I put the command into the terminal sudo apt-get install playonlinux. Everything was loading fine and it seemed to be working, however before ...
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Installing YADR on Ubuntu 14.04 error - prezto: old shell detected

I have a fresh install of Ubuntu 14.04 on VirtualBox, and I am trying to install YADR (https://github.com/skwp/dotfiles), which works really well on Mac OS X. However, after I finished installing and ...
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10 views

Standard LXC Container configs for shell scripting in Ubuntu?

I would like to do computation in neutral environment. I got a tip about Linux containers here. I am not sure how this project about Linux containers is managed, like who is the central board. ...
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22 views

Script does not run properly under cron - restart OpenVPN

I have a OpenVPN Server, that I connect via a VM (Ubuntu 14.04). In this VM I have the following script, that checks if the connection is up, and then if it's down, it restarts the openvpn service. ...
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3answers
37 views

Remove whitespace from all array elements

I have a array called arrayvar . Which is being defined as arrayvar=( $(awk '/'"$vovar"'/,/}/ {gsub("'"$vovar"'"," "); gsub("}"," "); gsub("{"," ");gsub(","," ");print}' temp1 | tr -d '\n' | sed ...
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431 views

Non-sudo alternative to /usr/local/bin for common scripts

I'm used to putting common scripts in /usr/local/bin so that I can execute them from anywhere with the terminal. For example, I make a shell script named 1, make it executable with chmod +x 1 and put ...
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1answer
35 views

Shell script to remove unity launcher(if present in Ubuntu 14.04 ) and/or the xfce panel (in the case of xubuntu)

Just want shell script to remove unity launcher(if present in Ubuntu 14.04 ) and/or the xfce panel (in the case of xubuntu). If anybody has idea about the same then please let me know. Thanks
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I want to allot ip adress using script file [on hold]

I want to allot ip adress using script file in my C Program ,i.e. by writing the ifconfig command in the bash file and calling it. Pls help how to achieve this.
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17 views

How to set environment variables for GUI program?

I am using texstudio, a latex editor, on Ubuntu 14.04. When I start it from bash $ texstudio, and click the compile button, it works fine. However, if I start it by clicking the icon in the launcher, ...
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61 views

A bash script to show logged off users [on hold]

Please help me create a bash script to show logged off users. It's easy to know which users are logged into a PC, the problem is to see those who are not, I have some time looking online, without ...
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1answer
24 views

How to use shell variables after doing sudo su

I am writing a script to fix a missing 'F' letter in a mail log file. The mail log file is continuously updating. I am getting a file name, after that I am doing 'sudo su' to get superuser access. ...
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24 views

Using sed to remove all lines containing special characters , numbers, and spaces

So I'm fairly new to using shell--bash specifically--and I'm in the process of writing a script which will translate files containing DNA sequences into a more useful format. Unfortunately, many of ...
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3answers
45 views

Add particular strings to an array sed/awk/grep

I have this ciscoFlashCopyStatus OBJECT-TYPE SYNTAX INTEGER { copyOperationPending(0), copyInProgress(1), ...
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1answer
24 views

core file size with ulimit

My question is probably not related to Ubuntu in particular, but since my desktop running this OS, I came to this forum. I am trying to change the core file size using ulimit -c command as follows: ...
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1answer
30 views

Storing some strings in a array

I have this sCSISmart1 TRAP-TYPE ENTERPRISE cyclone VARIABLES {cycHostAdapterNumber, cycHostAdapterID, cycManagerID} DESCRIPTION ...
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1answer
24 views

Passing Variable into awk gsub

I have this command Here vovar=OBJECTS prvar="$(awk '/'"$vovar"'/,/}/ {gsub("$vovar"," "); gsub("}",": %s,"); gsub("{"," ");gsub(",",": %s,");print}' temp1)" Contents of temp1 ...
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How can I tackle a pager formatting trouble with (certain) man outputs?

I ran into something that made me suddenly 25 years younger today. (Wish this could happen more often.) That long ago it was troff that occasionally did this; now see: $ man man -> normal output to ...
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Ubuntu 14.04 desktop goes to sleep when issued “poweroff” command while lid closed?

My ubuntu version is 14.04 LTS. I used the following command to shutdown the system after a certain process was completed (This process takes a long time to complete, so I needed a way to ...
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13 views

Getting Rid of Autojump

I just removed autojump and I still get this line whenever I access my command terminal: bash: /usr/share/autojump/autojump.sh: No such file or directory I used sudo rm -rf autojump as my primary ...
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create scatter plot

file (1. arg) will create (scatter plot) for n. column (x-axis, 2. arg) and m. column (y-axis, 3. arg) function is called myfun sourcefile 1 3 for scatter plot of 1. and 3. column from file ...
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262 views

How can I pipe the output of a bash or shell command to the clip board? [duplicate]

In order to minimize mouse usage (accessibility and health reasons), how can I pipe the standard out to the OS clip board? That is, I'd like to do something like: $ drush uli | ...
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appends n-th line from the file x at the end of the file y

I have been asked to write a command that appends the n-th line (MYN) from a file (x)to another file (y). Here's what I've done so far: MYN=4 hey=$(awk 'NR==$MYN' x) echo "$hey" >> y But why ...
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2answers
116 views

How do I write a Bash script for this scenario?

I have these files in the directory home/acs. TBBN027162G_38d8-2f08-0c40 TBBN027605G_38d8-2f08-1518 TBBN027941G_38d8-2f08-0d1c TBBN027923G_38d8-2f08-35e4 I want to read TBBN027162G as service_id ...
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2answers
177 views

How to cancel next job in order after rsync

If two jobs are entered into bash command line separated by semicolon: $ job 1; job 2; How do I cancel the second one? If I press CTRL+c, the first one will be canceled and 'job 2' would start, I ...
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5answers
268 views

How do I delete everything after second occurrence of quotes using the command line?

I have this store in a variable sCellEventTrap-03-28 TRAP-TYPE -- CAC Code: 00 ENTERPRISE compaq VARIABLES { scellNameDateTime, scellSWComponent, ...
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38 views

How to make a script delete a directory after checking for its existence?

How might one make a bash script which when run will check for the existence of a file/folder and if the file/folder is there remove it?
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62 views

How to change niceness of process by name

Java process is killing my computer (Intel i3, 8GB RAM). It takes over whole CPU and system starts to hang. I was trying to change niceness of java processes but i have to control it for all time and ...
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2answers
34 views

Make echo ignore spaces?

I have a file called temp1 sCellEventTrap-03-27 TRAP-TYPE -- CAC Code: 01 ENTERPRISE compaq VARIABLES { scellNameDateTime, scellSWComponent, ...
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13 views

OpenVPN --up called scrip does not work properly

I use such command to run my OpenVPN connection (part of script): gw=`netstat -rn|grep UG|awk '{print $2}'` openvpn --config ./openvpn.ovpn --up "./up $gw" >/dev/null 2>/dev/null& So I ...
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2answers
55 views

How to execute a custom script when Internet reconnects?

My Internet gets disconnected every now and then. I'd like to run a Bash script every time the Internet reconnects. The script is quite simple: #!/bin/bash mplayer /home/user/sound.mp3 It's placed ...
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1answer
94 views

How can I send commands to specific terminal windows?

I'd like to write a script for opening multiple programs (servers) simultanously in separate terminals - doesn't matter which one - and assign different commands to different terminals with commands ...
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2answers
41 views

Ubuntu can't find my bash-script at /usr/bin/

On my first Xubuntu I successfully copied my script trans.sh to /usr/bin, made executable and after that I can run it in any position of terminal, but my second Xubuntu can't find my script in ...
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Passing Strings to /bin/login

I'm in the process of creating a login wrapper for /bin/login so that when you boot Linux you get a TUI Login instead of the bland login on the tty console. This will be just a bash script for this ...
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1answer
45 views

Ubuntu shutdown script

I am using Ubuntu 14.04 and looking for updating an script to allow passwordless powering off my machine after executing set of commands. To do so, I have configured sudo shutdown now and it does the ...
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1answer
31 views

Add or remove locked Unity launcher items from terminal? [duplicate]

I've been building a very thorough script to handle the process of fresh-installing Ubuntu and setting it up just the way I like (as well as adapting it for use at where I work). It's a bash script I ...
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2answers
79 views

Does bash (or any shell, for that matter) have an 'overwrite' mode?

I'm running similar commands on (e.g.) a set of files. As an example, let's say I'm doing something like this (this isn't what I'm doing, it's just an example): > cat path/to/dir/file01.txt ...
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2answers
26 views

get two files together [duplicate]

how could I get two files together like this file1.txt: ROW 1 3 5 654 56 5 56 65 6 54 4 3345 35 53 3 32 2 1 ROW2 6 65 456 67 687 78 89 657 435 34 534 5 435 5 2 file4.txt: ...
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4answers
217 views

Bash create custom string

how could in bash a pattern like ROW1 n1 n2 n3 n4 up to 300 be done with some command in bash or also just perl...the delimiter would need to be \t as above