A set of dynamic variables that can affect the running processes.

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1answer
27 views

Trying to access environment variable (array) declared in ~/.profile from shell script

I'm currently fighting with this problem. I've already read some older posts here on SE, and got the conclusion that the only sane way to put a variable (even an array) is ~/.profile. So OK, array ...
1
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0answers
22 views

Setting XDG_DATA_HOME and XDG_CONFIG_HOME on compile/per program

The goal is to have a -dev version and a stable repository-based version installed at the same time, but with different data and config directories so that the dev version is not operating on(and ...
2
votes
0answers
50 views

Locale environment variable settings do not take effect

I have a Debian 6 (64-bit) VPS where I cannot seem to get the locale environment variables LANG and LC_* set. (Everything below as root). vps:~# locale -a C POSIX en_US.utf8 nl_NL.utf8 vps:~# locale ...
8
votes
1answer
173 views

Why does the location of Enviroment Variables vary that much?

Reading the book Hacking: The Art of Exploitation by Jon Erickson, I am trying to approximate the address of an environment variable SHELLCODE to exploit a program. Every time I run ...
2
votes
1answer
45 views

Which file defines the LESSOPEN environment variable?

please advise me about the following. On my Linux machine - I do the following: $ env | grep -i LESSOPEN LESSOPEN=|/usr/bin/lesspipe.sh %s So from env command I see that: ...
2
votes
2answers
53 views

How to find where is $JAVA_HOME set? [duplicate]

I'm a beginner with linux. I'm trying to change the value of $JAVA_HOME & I just can't seem to find in which file is it being set currently. I can't remember where did I set it the last time. ...
1
vote
1answer
26 views

Choice of editor when running under sudo

On an Ubuntu 12.04 machine I've used the alternatives system to set the editor to vim.basic. I get the correct editor when root but not when I sudo to root and run crontab, and I'm trying to ...
1
vote
1answer
27 views

Global variable for every script

I want to declare a variable in such way that every script can access and alter its value. I have written a script that set the value of a variable called flag on exit and I am using a crontab entry ...
1
vote
4answers
161 views

why do we not need export here?

$ IFS=";" $ read first second i am;a_i b c $ echo $first i am $ echo $second a_i b c $ echo $IFS Am I right that read first second is a subprocess of the current shell process? If yes, why don't ...
6
votes
2answers
116 views

Are environment variables visible to unprivileged users on Linux?

I'm trying to determine if, in Linux, environment variables for a process are observable by other (non-root) users. The immediate use case is putting secrets into environment variables. This is ...
1
vote
2answers
42 views

profile.d on headless server

Is it a bad idea to put variables needed by a daemon program running at boot on a headless system in /etc/profile.d/? From my understanding profile.d doesn't get executed until someone logs into the ...
6
votes
1answer
165 views

Echo difference between Ubuntu and Red Hat

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 environment variables. In Ubuntu I ...
1
vote
1answer
48 views

Where can I set global Java Options?

I have horrible, improperly-rendered fonts in Java programs such as jabref and rubymine. This can be fixed by running _JAVA_OPTIONS='-Dawt.useSystemAAFontSettings=on' jabref I understand that I ...
0
votes
1answer
37 views

How set glib environment variable: g_slice

I've been told I need to set the following environment variable in order to work around a glib bug: G_SLICE=always-malloc But I don't know how to do it, and anywhere I've seen it's use recommended, ...
2
votes
2answers
93 views

How is PATH set for users in puppet?

I'm having an interesting problem which I was able to work around by manually specifying PATH. The problem is that although my root user's PATH is: ...
1
vote
0answers
168 views

Inherit environment variables in systemd Docker container

I have a Docker container running systemd. I want to pass environment variables to applications under it. When I start systemd from within Docker (/sbin/init as command line), Docker exposes ...
20
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2answers
835 views

Does ~ always equal $HOME

I know this has probably been asked before, but I couldn't find it with Google. Given Linux Kernel No configurations that change $HOME bash Will ~ == $HOME be true?
5
votes
3answers
161 views

Run program with environment set to variables in a file

I would like to run a program (in this case Python) with only the environment variables defined in a file, say vars.env: FOO=bar X=12 Here's a simply Python script that prints the environment: ...
4
votes
1answer
159 views

Keep getting the same result after “export PATH”

I am doing this: $ which cabal /usr/bin/cabal $ export PATH=$PATH:$HOME/.cabal/bin $ which cabal /usr/bin/cabal I expect to get /.cabal/bin/cabal for $ which cabal (this path exists) after this. ...
2
votes
1answer
59 views

How can I find where LANG, LANGUAGE and MAIL environmental variables are set?

I've had a few issues with environmental variables not set correctly in my Raspbmc Raspberry Pi. Specifically, I've had to manually specify the following in ~/.bashrc. export LANG='en_AU.UTF-8" ...
2
votes
0answers
133 views

Reading from /etc/environment with sudo

Using Ubuntu 14.04 LTS, I'm having a problem trying to read environment variables from /etc/environment when using sudo env. Basically, they are not being displayed. When I do just env, these ...
13
votes
3answers
394 views

Using variables to store terminal color codes for PS1?

In my .bashrc, I use ANSI terminal color codes to colorize various bits. It looks like this: PS1='\u@\h:\w\[\033[33m\]$(virtual_env)\[\033[32m\]$(git_branch)\[\033[0m\]$ ' where virtual_env and ...
15
votes
2answers
428 views

How do I start all shell sessions in a directory other than $HOME?

When I open my non-login shell in Ubuntu, my present working directory is /home/user_name (my $HOME environment variable), but I want to change this such that when I start my terminal I am in some ...
0
votes
2answers
60 views

Why do I have to execute bash programs with ./? [duplicate]

Why is it that some bash programs will only run on my system when I type ./ before their name? An example: In my [...]/android/sdk folders I have to execute adb like this: ./adb devices Why not ...
3
votes
3answers
226 views

Messed up bash.bashrc file, commands not working anymore

Trying installing Java, I tried to add it to the executable path with the line: export PATH=/usr/lib/jvm/jdk1.7.0_60/bin:$PATH in the system-wide /etc/bash.bashrc file. For some reason this ...
2
votes
1answer
218 views

Bash script for running python virtual environment does not execute

I am trying to wrap the following call into a script, which runs my Python virtual environment: [lucas@lucas-ThinkPad-W520]/home/lucas/bin$ source ...
1
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0answers
24 views

Programmatically obtain LILYPOND_DATADIR for execlp() call

I wrote an application that calls lilypond by execlp()ing it. However, when my app executes this line, the following error occurs: GNU LilyPond 2.16.2 warning: not relocating, no 2.16.2/ or current/ ...
8
votes
4answers
135 views

Save output of command that modifies environment into a variable

How to save output of a command that modifies environment into a variable? I'm using bash shell. Assume that I have: function f () { a=3; b=4 ; echo "`date`: $a $b"; } And now, I can use commands ...
1
vote
1answer
46 views

Multiple MODULEPATH entries in .modulesbeginenv

I'm switching between paths/code projects. At each place I have different modules. To handle this there is a setup script that modifies what to use. This is handled with the tool 'module'. NOTE: ...
0
votes
0answers
31 views

Parameters files, pfiles director: how to overwrite default settings

This is a quite general question that I am not sure to be able to address correctly. I must manage some bash or tcsh scripts that invoke other software's tools. These tools are invoked by name and ...
4
votes
1answer
256 views

how to set environment variables from a shell script? [duplicate]

I'm trying to set environment variable through a shell script. Here is the script with various techniques: #!/bin/sh echo "export SOMEPATH=/root/some" >> /root/.bash_profile echo "export ...
6
votes
2answers
205 views

if statement in .bashrc not working correctly

I set up .bashrc to show a long prompt if the terminal is at least 80 characters wide. Otherwise it shows a degraded, smaller prompt. I use an if statement to achieve this: dp_smaller_than=80 if [ ...
2
votes
1answer
49 views

What does the period indicate when an environmental variable is set like “VARIABLE_NAME=.”

What does the period indicate when an environmental variable is set like VARIABLE_NAME=.
5
votes
3answers
326 views

Is there any harm in using variables that aren't set?

Say I have the following code: # Check if the color prompt is enabled and supported on this system if [ -n "$force_color_prompt" ] && [ -x /usr/bin/tput ] && tput setaf 1 ...
1
vote
2answers
71 views

How to guarantee availability of $BASH_ENV

A non-interactive, non-login shell will try to source any script specified in $BASH_ENV. But how do I guarantee $BASH_ENV is set before a cron job or script has a chance to set $BASH_ENV for any ...
1
vote
2answers
251 views

Setting PATH vs. exporting PATH in ~/.bash_profile [duplicate]

What's the difference and which is better to use when customizing my bash profile? Documentation on the export command is scarce, as it's a builtin cmd. Excerpt from version 1 of my ~/.bash_profile: ...
2
votes
0answers
14 views

Why does xdg-open text_file differ from sudo -u me xdg-open text_file?

If I run the following command, the text file opens in my preferred editor (kate). $ xdg-open text_file However, if I try the following, where sparhawk is my username, I get several warnings, and ...
5
votes
1answer
69 views

What else can break if I remove export from a variable?

My problem is that when I started coding my script I encountered several variable scope issues which resulted in the bad habit of exporting almost all my variables. Now that my code has got quite ...
3
votes
4answers
92 views

Protected environment variables?

Are there names of environment variables that cannot be overwritten by the user/a call to setenv? As I understand from POSIX1.2008, any process may edit the environment block, but must avoid ...
1
vote
2answers
392 views

How do I get a variable's value from one script and import it in another script?

How do I get a variable's value from one script and import it in another script? But the catch is that the script where I am going to get the variable's value has also some commands that I don't want ...
4
votes
3answers
191 views

Environment variables are not set when my function is called in a pipeline

I have the following recursive function to set environment variables: function par_set { PAR=$1 VAL=$2 if [ "" != "$1" ] then export ${PAR}=${VAL} echo ${PAR}=${VAL} shift ...
2
votes
4answers
180 views

How do I pass a variable from my local server to a remote server?

I am trying to pass a variable from my local server (location1) to a remote server (location2). The purpose of the code is to copy a file from the remote server from a predefined location. In simpler ...
1
vote
1answer
26 views

Sourcing scripts with a for loop for different variables

I have several shell scripts that I summarised within a global script. I am using some variables that are the same across all scripts, and I wrote a separate script for this, which I am sourcing in ...
21
votes
3answers
782 views

If processes inherit the parent's environment, why do we need export?

I read here that the purpose of export in a shell is to make the variable available to sub-processes started from the shell. However, I have also read here and here that "Processes inherit their ...
3
votes
1answer
101 views

Difference between “.” and “./” while setting the environment variables using export? [duplicate]

Please excuse me if I am not clear while asking questions. I will try my best to be very clear while asking questions. While learning Embedded Linux, we are setting an environment for our project. ...
1
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0answers
63 views

Create global enviromental variable after boot

I know about /etc/profile and /etc/environment, but I would like to set a global environmental variable after boot and login. By global, I mean an environment variable that can be accessed by any ...
1
vote
2answers
154 views

Variable value is not recognized after using gnu parallel?

I have a below shell script from which I am trying to copy 5 files in parallel. I am running my below shell script on machineA which tries to copy the file from machineB and machineC. If the file is ...
2
votes
2answers
65 views

What environment and credential is used by startup, background and service processes

Startup scripts (on boot) Processes running in (or sent to) the background (when using SSH -fN for example) Services etc... What $path variable will they be using? What credentials? Anything else I ...
18
votes
5answers
1k views

why is setting a variable before a command legal in bash?

I've just encountered several answers such as to parsing a delimited text file... that use the construct: while IFS=, read xx yy zz;do echo $xx $yy $zz done < input_file where the IFS ...
4
votes
1answer
243 views

System environment variables not appearing in sudo

I have the following line my /etc/environment file: BROKER_URL=tcp://xxx.30.8.163:61616 I run this and get: $ set|grep BROKER_URL BROKER_URL=tcp://xxx.30.8.163:61616 Then, I run: $ sudo bash # ...