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

learn more… | top users | synonyms (1)

1
vote
1answer
33 views

A bash scripting problem

In advance , I'd say I know the basic syntax of bash scripts but the following statement is not recognized for me : if [ ! -f /etc/debian_version ] could you help me what this condition going to ...
0
votes
2answers
96 views

A strange problem about terminal or command environment

Two weeks ago I was learning Python and Flask. I followed step-by-step the steps in The Flask Mega-Tutorial, Part I: Hello, World!. While I was following the tutorial, I had problem in "virtualenv", ...
1
vote
0answers
89 views

Desktop Environments Incorrect After SLiM Install

I am working on making an automated install based off of Lubuntu using Debian Installer so that the install is as automated as possible (a few inputs at the very beginning). So far I am mostly pleased ...
1
vote
1answer
454 views

PATH is not getting exported by default in Ubuntu 12.04

When i run su on command line and enter root password, I am getting error as mentioned below: Command 'lesspipe' is available in the following places /bin/lesspipe /usr/bin/lesspipe ...
0
votes
1answer
686 views

Why isn't Roundcube's Upgrade Shell Script Working?

I am trying to upgrade my Roundcube installation from version 1.0.4 to 1.0.5 and I cannot get the upgrade script working properly. According to Roundcube's upgrade documentation, the following command ...
0
votes
2answers
265 views

bash script dollar sign operator $ question - is it incompatible to ~ operand?

I am new to the Linux environment. After a quick search I could not find a helpful question about the $ operator used in bash scripting. I do not know if this question relates more to the Ubuntu (or ...
30
votes
4answers
73k views

How do I clean or disable the memory cache?

After the system starts, in a few minutes my memory cache fills up and it starts using the swap. Here's a screenshot of /proc/meminfo. However, if I can disable this process / clean the cache once ...
9
votes
3answers
15k views

Changing behavior of bash prompt when functioning as root

Before you click away, this isn't the typical "how do I make my bash prompt have color" question. I've already customized my bash prompt to look like this: [user @ host]----[$(pwd)] $ where ...
20
votes
6answers
21k views

How to start a terminal with certain text already input on the command-line?

Rather than rephrasing my question, let me describe to you the desired user-case: I create a short shell-script to run command "gnome-terminal --someoptionflagname 'my text to be posted'", and ...
1
vote
1answer
106 views

Editing my Bash prompt

I'd like to put something into my bash prompt, but I'm not quite sure how to do it. I use the Cloud Foundry Command Line Tool to push code up to my servers. The cf tool can be set to a specific ORG ...
0
votes
1answer
781 views

Can't call wget from Python script [closed]

I am writing this script that executes a bunch of commands one of which is to download some packages from a certain url. Following is my script #! /usr/bin/env python #! /usr/bin/env bash import os ...
1
vote
1answer
283 views

Prevent *buntu from updating dictionaries during install

In utilizing Vagrant to install an Ubuntu server box with a GUI (lxde), the shell provisioning fails due to what seems to be a frequent issue when setting up dictionaries. The resolutions seem to all ...
0
votes
1answer
103 views

Match Pattern and write following value as variable

I'm trying to match a pattern and then pull the following information to create a file using that variable. Example (my data may look like either of the 2 examples) "headers": { "...
1
vote
1answer
185 views

What does `printf` do in rc.local?

I've encountered an /etc/rc.local script that gets some data and uses printf on it. My question is: where does that data that is printed go when rc.local is executed on startup? Is there a log file ...
1
vote
1answer
111 views

My script only opens new terminals when the previous command's terminal is closed

Sorry if my title is a little hard to understand, I tried to condense the issue as much as possible. I'm trying to run a bash script which opens a new terminal for each major command, that way I can ...
0
votes
1answer
417 views

gsettings not working from within bash function

Pretty New to bash and only 6 months into ubuntu so please bare with me. Im creating a post installation script https://github.com/jjdemitriUk/relutionDev everything is going well so far its written ...
1
vote
3answers
888 views

Sudo command in bash script halts the script

I have an early 2009 iMac with a sensor problem. The ODD and CPU fans run at full speed. To get them down to minimum speed in Ubuntu I need to set the speeds in the Terminal, using this method. Rather ...
4
votes
2answers
375 views

Run the file in folder called `python` not the python interpreter

I have a folder. Inside of this folder is an executable called python. When I try to run python from the terminal it instead runs the python interpreter. How can I run the file called python?
11
votes
2answers
1k views

Re-run an application script when it crashes?

I have some applications that need to run on my laptop all the time. I use a bash script to start these applications. In my script I have a loop that looks similar to this: while true; do ...
1
vote
1answer
93 views

Get window name of byobu session in bash

is there a way to get the byobu window number (or window name) in shell? I want the same code to behave differently depending on the window in which it is running: I am thinking about something like ...
1
vote
1answer
259 views

Fast change of my ip/proxy in terminal for one command

I need to change my IP for one command in bash command line, so I want use proxy (123.123.123.123:80 format), how can I do it? For example if I write: curl ifconfig.me I get my original IP, so how ...
1
vote
1answer
197 views

While Loop Syntax Error

I'm attempting a modification of apt-fast to support parallel downloading and installation. I'm having some trouble with this loop: get_install(){ while ((!${pkg}-finished)) do if [ "$CURNUM" -lt "...
1
vote
2answers
323 views

How can I delete all folders of a specific name without deleting Contents in it?

How do I delete all Folders with a specific name (e.g. 128Kbps_Songs) without deleting its files For example if I have directory "MP3_SONGS" with subdirectories "A", "B", "C" and each subdirectory ...
0
votes
1answer
399 views

Getting a dpkg error when using apt-get upgrade

I am getting this dpkg error when using apt-get upgrade: dpkg: error processing package bash (--configure): package is in a very bad inconsistent state; you should reinstall it before attempting ...
51
votes
2answers
32k views

What are login and non-login shells?

It is said that settings for non login shell to go into .bashrc file and login shell settings to go into .profile file. What is really meant by login and non-login shells? Please explain without ...
0
votes
2answers
599 views

Script to find size of image files

I've got image files scattered all around my computer so I'd like to write a script that receives as input a full path to a directory, display the total size of image (.jpg , .jpeg) files in each of ...
1
vote
2answers
826 views

How to return default PS1 prompt?

After installing docker (I definitely think this is about docker) I got changed cmd-label. For instance, it was like username@root8hgf858$: your_command to [:/home/username] $. How can I fix it? I'...
1
vote
1answer
151 views

How do I fill certain percentage by height of an image using ImageMagick commands in ubuntu?

I have an image with around 20% of its bottom filled with white color. But the image has some dots of other colors than white. I have 100s of such images which I would like to remove those dots from. ...
0
votes
1answer
643 views

Bash Script - Editing Lines on Text From File

I'm using a bash script to read in data from a text file. #!/bin/bash file="/home/nexusfactor/Desktop/inputData(linux).txt" while IFS= read -r line do # display $line or do somthing with $...
2
votes
2answers
463 views

How to use 'if' inside '-exec' attribute of 'find'?

I have a directory with many pairs of files. Each non-text file has a textual description partner. For example a directory can look like this: a.jpg a.jpg.text b.ogv b.ogv.text cd ef.JpG cd ef.JpG....
3
votes
1answer
327 views

How to display all services and version that runs on a host?

I am trying to display all services and their versions that runs on a host using ports from 1 to 1023, in this way: ssh, OpenSSH 5.9p1 Debian 5ubuntu1 (protocol 2.0) smtp, Postfix smtpd http, Apache ...
-1
votes
2answers
168 views

bash comparison of integer always returns true?

I have the following simple bash script. for some reason it always returns true. #!/bin/bash service=hhvm status=($(ps -ef | grep -v grep | grep $service | wc -l)) if [[ $status -eq 0 ]]; then ...
93
votes
3answers
192k views

What is difference between #!/bin/sh and #!/bin/bash?

if I write, #!/bin/bash echo "foo" or #!/bin/sh echo "foo" both yields same. I have seen some scripts starting with #!/bin/sh or #!/bin/bash. Is there any difference between them?
0
votes
1answer
108 views

autoremove option doesn't work with apt alias

I have set up an alias for apt-get as apt, for convenience. This works fine, I can do sudo apt install PACKAGE sudo apt remove PACKAGE sudo apt update etc with no issues. However, the autoremove ...
0
votes
2answers
1k views

How to read user last email using a shell script?

Let's say I have two machines A and B On A I have installed and configured a SMTP and IMAP server For example I have user: george with password: 123456 on Machine A I am trying to write a shell ...
2
votes
1answer
4k views

QEMU Connect physical disk [closed]

I made a windows virtual machine on my ubuntu pc using the following script (found online). #!/bin/bash configfile=/etc/vfio-pci1.cfg vfiobind() { dev="$1" vendor=$(cat /sys/bus/pci/...
98
votes
1answer
131k views

'sudo su -' vs 'sudo -i' vs 'sudo /bin/bash' - when does it matter which is used, or does it matter at all?

When I'm doing something that requires root be typed in dozens of times in a row, I prefer to switch my session to a root session. In the various tutorials and instructions I have used on the Internet,...
5
votes
1answer
961 views

Desktop icon position (programmatically access and manipulate)

I'd like to programmatically access and manipulate the Desktop icon positions, their icons, etc. This is for files and directories that you keep in ~/Desktop . Where is this stuff stored?
4
votes
2answers
851 views

Why isn't this script to delete part of my command history working on my computer?

The script can be found here: http://stackoverflow.com/questions/14750650/how-to-delete-history-of-last-10-commands-in-shell For convenience here it is: for x in `seq $1 $2` do history -d $1 done ...
0
votes
1answer
615 views

Problem setting up Environment for 'make' command execution

I am trying to set up devkitPro for ARM use, but I continuously get an error while executing the last two commands. The commands are make and make install. The tutorials I am following: http://...
1
vote
0answers
141 views

Errors in update checking script (cause: repositories not available)

I have a scripts that tests if updates on my 14.04 server are available, and send me a text message if that happens. The bash script begins with: IFS=';' read updates security_updates < <(/usr/...
1
vote
1answer
2k views

Ubuntu / Bash recognising “export PATH=$PATH:~/…” but not “export PATH=$PATH:/home/…”

So I've been using ubuntu since 09.04 but have limited experience with sys admin. I now want to get into web development and as part of installing the Play Framework, I had to add the activator path ...
4
votes
2answers
4k views

Bash script to automate truecrypt volume creation, mounting and unmounting

I am trying to code a bash script that will automate the several tasks related to truecrypt. Tasks are: Creating a truecrypt volume, mounting it, copying a file in filesystem, modifying the file, ...
2
votes
1answer
402 views

Locate the id of input device and change the value of its property

I learned from this post that you can set mouse speed by the following: $ xinput --set-prop 10 "Device Accel Constant Deceleration" 4 where 10 is the id of the target device, which you can obtain ...
0
votes
2answers
82 views

/usr/bin/ or ~/bin/ priority

Here's a hypothetical situation....There are two binaries with the same name. Lets call them charles. One charles is in the /usr/bin/ directory and the other charles is in ~/bin/. Assuming that ~/bin/ ...
0
votes
2answers
205 views

Best way to schedule script, crontab or other options?

I never use crontab, and while it ask me for root password, I am careful. So my question is, I have to run periodically (let's say every 30 min)a simple script for analyze the text file, which is ...
0
votes
1answer
1k views

Is it possible to use variable in sed command in unix bash script [duplicate]

I trying to solve following problem. With great helps of others here, I can write and understand simple do loop in bash scripting. Now I try to do this: In "mein_directory" directory I need ...
3
votes
1answer
2k views

Alternatives for [variable = string substitution] in bash

I am learning bash and trying to understand the different ways of making a substitution and assigning it to a variable. Specifically, I'm changing Unix slashes ('/') to Windows ('\'). References: ...
0
votes
1answer
110 views

What does 'history | grep cp -r ' do?

I typed this commands by mistake in my shell and then my shell was filled with all the text . I don't know what it does .Please someone explain it to me .
1
vote
2answers
196 views

how to fix my keyboard after a bash script messed it up

Okay, I was stupid. I ran a bash script I got off of some forum on the internet, github I think it was, that said a cool matrix would appear in the terminal, which did happen, but it also messed up my ...