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

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30
votes
9answers
23k views

How do I restrict my kids' computing time?

Access to our computer (not only to the internet) needs to be restricted for the accounts of my kids (7, 8) until they are old enough to manage this by themselves. Until then we need to be able to ...
0
votes
0answers
6 views

Problem during the usage of up and down keys for checking up and down arrows

I am facing an issue during the usage of up and down on gnome-terminal. Lets say my previous commands are vi pos_of_rightmost_setbit.cpp gcc -o harsha pos_of_rightmost_setbit.cpp At this point ...
2
votes
2answers
123 views

How do I get `tr` command to ignore newline?

I want to replace multiple spaces by a single space. I am using tr to do this. But it is also replacing new line with a space. How can I avoid it? Code: tr -s [:space:] ' ' Input: He llo Wor ld ...
1
vote
1answer
16 views

Desktop shortcut doesn't work for script but script work fine

#!/bin/bash/ ls -1 *.mp3 > playlist.m3u for (( ; ; )) do mplayer -playlist playlist.m3u; sleep 0.1; done This is the script and it works ! [Desktop Entry] Version=1.0 Type=Application Name=Play ...
0
votes
1answer
27 views

BASH script for extracting archives - how to make the script ask for folder destination?

I've started using the bash script below, for unpacking archives. How would I go about making the script ask if I would like to specify a folder, or just use the default folder to extract to? I'd ...
48
votes
9answers
101k views

How to clear bash history completely?

I want to clear all before command from history of my server. I use history -c it seems all things are cleared but when I ssh to the server,all commands are still there. How can I clear them ...
0
votes
0answers
29 views

Terminal flashing between current and previous screen

I just upgraded from Ubuntu 12.04 to 14.04. After upgrading the terminal will sometimes, but not always, flash between the current screen and the previous screen. Here are some examples: The output ...
0
votes
0answers
18 views

bash: Permission Denied when I move my CPP file to another location

I crafted a test CPP programme. It created a file in the home directory. It compiled with ease, and I could run it by typing ./rocketfire in the Terminal. Now, I did these: abhimanyu@AbhimanyuPC:~$ ...
1
vote
2answers
35 views

Changing environment variables

I just changed my /etc/environment file to: M2_HOME=/usr/local/apache-maven/apache-maven-3.1.1 M2=$M2_HOME/bin ...
4
votes
2answers
292 views

Why do I get different outputs in case of sh and bash?

I have the following simple script: #!/bin/bash echo "Bash version ${BASH_VERSION}..." for i in {1..99..2} do echo $i done Output in case I run with sh file.sh: Bash version ... {1..99..2} ...
0
votes
0answers
822 views

GNU GRUB version 2.02 beta 2-9

I attempted to load Windows 8 and Ubuntu alongside each other and it was working well until my Ubuntu installation completed and I restarted the computer. Now I can't get past this error: ⠀Minimal ...
1
vote
2answers
44 views

How to get a colored bash?

How to get the bash colored like this?
5
votes
5answers
688 views

How to compare two files

So basically what I want to do is compare two file by line by column 2. How could I accomplish this? File_1.txt: User1 US User2 US User3 US File_2.txt: User1 US User2 US User3 NG Output_File: ...
30
votes
5answers
34k views

How to list all variables names and their current values?

Including not only $HOME, $PWD etc but any other you have defined.
-1
votes
2answers
31 views

in a file match a stringa and print lines matching another stringb

Basically , i have a large file with more than 5000 lines in the following format Below snip given two blocks of the entire file. What i need is to search for given String name (eg: abcd etc) , and ...
0
votes
4answers
607 views

How to prevent script not to stop after apt-get?

I keep some bash snippets and copy&paste them when I needed for management. But I discovered apt-get cancels script execution. Here's my script where problematic. apt-get -y install gcc g++ make ...
0
votes
1answer
20 views

Redirect input from file

I'm writing a script (TEST.sh) that must run another script (TASK.sh)... Task.sh need two input... so I was thinking to redirect input from a file (I need to automize everything)... So, I was using ...
3
votes
1answer
35 views

Way of receiving alerts on login attempts, whether successful or not?

I believe my linux machine to be reasonably protected from external login. But since I am mildy paranoid, I would like to be alerted when there is a login attempt made to the server, whether ...
13
votes
4answers
9k views

How do I set up an email alert when a ssh login is successful?

Does anyone have a bash script that will email or notify someone in the case of a successful login to a ssh server? I want to be notified if anyone logs into my personal box. I'm using Ubuntu 12.04 ...
14
votes
8answers
25k views

How do I rebuild a corrupt dpkg status file?

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 ...
0
votes
0answers
28 views

How to rename various file extension into an extension [duplicate]

I have many files in a directory with various extension (files.txt, files.html, files.jpg, etc). I need to change all the extension of these files into an extension (files.ext.backup). So, I will ...
1
vote
2answers
15 views

Automatic screen capture script

I'm looking to accomlish exactly what Anwar Shah describes here Bash script to take screenshot and save the image - Ubuntu with the added functionality of setting a time increment for the script to ...
0
votes
1answer
8 views

Convert fb2 to txt

There are still a lot of devices that can't read fb2 and able to read txt. Also, txt version could take much less space compared to uncompressed fb2.
1
vote
1answer
11 views

How to disable notifications sound while XBMC is runnig?

I would like to know if it's possible to disable notification using XBMC (mails, network etc). I'm using Kubuntu 14.04.1. I've found this command but the script doesn't work, the sound is re-enabled ...
0
votes
2answers
30 views

setting up a script to rotate scren Lenovo Yoga Thinkpad S1

I am trying to set up a Lenovo Yoga Thinkpad S1 to rotate the screen with the touch of a button but I am having a little trouble with the script that actually does the work. I have found the scripts ...
0
votes
1answer
46 views

Is sim a shell script command?

I was creating a sym-link for practice in Ubuntu 14.04. I meant to use this command: ln -s ../fun dir1/fun-sym It was taken from a book I am using. Except I used sim at the end by mistake. So the ...
3
votes
1answer
704 views

How can I mark all packages with installed dependents as “Automatically Installed”?

There are some similar questions, but here is precisely what I would like to achieve and the dots which I am having trouble connecting: Query a list of "Manually Installed" packages (apt-mark ...
7
votes
3answers
6k views

How to delete selected results from bash history?

history command shows all the results but we can filter to get particular command using history | grep searchingCommand. It is really helpful. But the problem is it shows those commands also which ...
17
votes
3answers
249 views

What is the $BASH_COMMAND variable good for?

According to the Bash manual, the environment variable BASH_COMMAND contains The command currently being executed or about to be executed, unless the shell is executing a command as the result of ...
1
vote
0answers
16 views

Slow bash tab completion

My bash shell's tab completion is very slow, usually taking 1-2 seconds per completion. This only seems to happen when I'm using my laptop from work. Tab completion is very speedy when using my laptop ...
1
vote
1answer
36 views

can't make juju charm-store server?

I am trying to run juju charm-server in my local machine.I followed these steps.(https://github.com/juju/charmstore) but it gives this error.When i enter make command it gives this one. Makefile:49: ...
-1
votes
1answer
29 views

run bash script from another script and redirect its output

Hi everyone I have to do a program.. I'll be really concise to explain it... And hat I've already done and what i have to do... Simply, I have to do a "simulator" in Bash that run exercises of ...
0
votes
1answer
21 views

Simple bash script not working

I'm pretty new to bash scripting. I'm trying to make a script to export the http_proxy variables. This is what I do from the terminal: $export http_proxy=http://proxy21.iitd.ernet.in:3128/ $export ...
0
votes
2answers
33 views

End script and restart it with the same options and arguments

Usually !! repeats the last given command. But it doesn’t seem to work in a bash script. Is there a way to end a script and repeat it with the exact same options and arguments given the last time? ...
0
votes
1answer
26 views

problem occuring while creating .exe file

I'm trying to run test problem in the mfix but got struck with an error sh: 0: Can't open ../../model/make_mfix. bhaskar@admin2-Precision-T7600:~/mfix/run/tests/Added_Mass$ sh ../../model/make_mfix ...
0
votes
1answer
37 views

Run terminal command (python command) at start up [duplicate]

New to Ubuntu, but have looked everywhere to get this question answered. Found no solution so far. Basically I need to run two terminal commands on startup, which follow each other directly. This will ...
0
votes
1answer
24 views

Home files and folders permissions could not be determined

I was trying to create a default configuration file for activemq with the command sudo ./activemq setup [ /etc/default/activemq | /home/leo/.activemqrc ]` Then recieved this message: INFO: ...
0
votes
1answer
24 views

Same program, different version, in different locations…how to specify which to use?

Hi all I'm trying to run a program called cufflinks on my machine, however there appears to be a version of this in multiple places on my existing system. For example when I typed whereis cufflinks ...
2
votes
3answers
39 views

How do I manage changing users in a charm?

I'm writing a charm in which I need to change user to install some packages. When I start juju-deploy all this running as root... So, I try to change my user and is not possible. If anyone has any ...
1
vote
0answers
33 views

How do I open an URL from a bash script?

I have a simple script to start a node.js webserver and open the URL in a browser. However the last part doesn't seem to work, it wont open the URL in a browser (or anywhere else). This is the code I ...
0
votes
0answers
28 views

Terminal closing itself after 14.04 upgrade

All was fine in 12.04, in this case I'm using virtualbox in Windows. The upgrading process ran ok, no errors, no warnings. After rebooting the errors started to happen. Just after booting up there ...
0
votes
0answers
17 views

no such package beginner tutorials

I'm using Hydro. I am new to this. I was reading the book "A Gentle Intro to ROS" by Jason M. O'Kane. I got up to the section "Creating a package". I was following the "create a workspace" and ...
0
votes
2answers
13 views

How can I make DNSMASQ bindings in human readable format?

I want to setup an alias or a script that will allow me show the DHCP bindings dnsmasq has. $ cat /var/lib/misc/dnsmasq.leases 1411349054 08:11:96:e9:52:ec 192.168.1.96 W11837894 * 1411413528 ...
0
votes
0answers
15 views

Backup function

I am attempting to make a function that you provide it a file name, it then make a back up of the file and slaps on a time stamp to mark the file. Once it time stamps the file it prints out all files ...
2
votes
2answers
80 views

bash utility 'dialog' leaves a messy screen

When I run this script it displays options in a menu style on my terminal and then runs the relavent command in the script. #!/bin/sh TEMP=/tmp/answer$$ dialog --ascii-lines --title "Administrative ...
12
votes
4answers
1k views

What does /dev/null mean in a shell script?

I've started learning bash scripting by using this guide: http://www.tldp.org/LDP/abs/abs-guide.pdf However I got stuck at the first script: cd /var/log cat /dev/null > messages cat /dev/null ...
0
votes
0answers
19 views

when building u-boot /bin/bash: arm-none-linux-gnueabi-gcc: command not found

I am currently running Ubuntu 12.0.4 on a 64 bit machine. I have an AM335X development board. Along with the kit came the compressed kernel (linux 3,2), rootfs, u-boot, and ARM cross compiler ...
2
votes
0answers
31 views

Echo difference between Ubuntu and Red Hat [migrated]

I have mostly been experimenting with Ubuntu but recently was using a Red Hat Enterprise system and was surprised at a difference I found setting and displaying env variables. In Ubuntu I might have ...
2
votes
2answers
63 views

What is wrong with this script?

So I got this script from this guide: www.tldp.org/LDP/abs/abs-guide.pdf LOG_DIR=/var/log ROOT_UID=0 LINES=50 E_XCD=86 E_NOTROOT=87 if [ "$UID" != "$ROOT_UID" ] then echo "Must be root to run this ...
0
votes
1answer
21 views

bashrc script not accepting space in directory name

I have added a variable at the end of my ~/.basrc file : export xyz = /home/faizal/DEV/ADT workspace/xyz But if i open a new terminal, i get the error : bash: export: 'workspace/xyz': not a valid ...