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

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9
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1answer
250 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 ...
4
votes
1answer
958 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: ...
1
vote
1answer
403 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 ...
5
votes
2answers
13k 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. ...
9
votes
2answers
6k views

What is the significance of single and double quotes in environment variables?

I defined some environment variables in my .profile like this: MY_HOME="/home/my_user" but the variable does not seem to evaluate unless I strip off the quotes and re-source the file. I believe ...
1
vote
1answer
68 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
229 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
476 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
210 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 ...
0
votes
1answer
404 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
2k 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: ...
2
votes
3answers
1k views

Upstart - load bashrc variable

I'm wondering how to load bashrc variables in an upstart script and run (node.js in that case server). What is the best way to do it? I tried this: exec sudo -u someuser $NODE_PATH ...
22
votes
2answers
939 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?
1
vote
1answer
403 views

Executing commands with PHP: using normal user, but its home directory is /root

I'm using a custom compiled installation of Apache + PHP, listening on port 80. Apache is configured to run as a normal user, with the proper settings User and Group of the httpd.conf file. After ...
5
votes
3answers
471 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: ...
3
votes
3answers
4k 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 ...
5
votes
3answers
14k views

Adding directory to PATH through Makefile

I'm having some trouble in exporting the PATH I've modified inside the Makefile into the current Terminal. I'm trying to add to the PATH, the bin folder inside wherever the Makefile directory is. ...
2
votes
0answers
447 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 ...
4
votes
1answer
452 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
208 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" ...
16
votes
3answers
12k views

.bash_profile not sourced when running su

I have a user, say user1, which has modifications to its .bash_profile, one of them changing the PATH, e.g.: export PATH=/some/place:$PATH. This change works fine if I log on as user1 or do a su - ...
19
votes
2answers
3k 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 ...
16
votes
3answers
2k 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 ...
8
votes
4answers
263 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 ...
0
votes
2answers
98 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 ...
2
votes
1answer
451 views

Openbox doesn't seem to have correct environment variables set

I've installed Debian 7.0, and then installed Openbox on top of it. I've got some executable files in ~/bin, and this line in my .bashrc and .profile: export PATH="$HOME/bin:$PATH" I can normally ...
2
votes
1answer
719 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
vote
0answers
42 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/ ...
1
vote
1answer
259 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: ...
8
votes
1answer
13k 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
605 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 [ ...
5
votes
3answers
407 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 ...
2
votes
1answer
53 views
2
votes
2answers
15k 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: ...
4
votes
2answers
644 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 ...
5
votes
2answers
2k views

How can I expose JAVA_HOME to applications running under X and/or Gnome?

I'm trying to run IntelliJ from Gnome3's Applications menu, but it complains the JAVA_HOME variable is not set. I have the Java installation under my home folder. I managed to export the variable in ...
5
votes
1answer
127 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 ...
2
votes
0answers
60 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 ...
3
votes
4answers
244 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 ...
3
votes
1answer
534 views

Why can I only use apt-get when I use “su”?

Not sure what info you need here, if any. Just let me know. I have a proxy that bypasses the corporate net set in my profile file for both su and normal user. When I do a sudo or regular apt-get ...
4
votes
1answer
13k views

how to make PKG_CONFIG_PATH variable to refer an installed library?

I am in the process of installing the required libraries for FireFox 3.6 on a Redhat Linux Nash 4.x system. I already have successfully installed the glib2.12.0 library, but When I ./configure the ...
1
vote
2answers
2k 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 ...
5
votes
3answers
625 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 ...
1
vote
4answers
1k views

chmod - change permissions on a file

I have a Python virtualenv, and the Python executable is located in the /bin directory. In this virtualenv I'll have to execute some unsafe code, that can damage my system. I tried to chmod a-r on the ...
1
vote
1answer
45 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 ...
5
votes
7answers
2k views

how to share environment variables between shells like globals related to a master pid?

So, I need to share environment variables between shells, and that the changes on the variables be promptly recognized by all shells, like global variables. But they must be related to a master pid, ...
0
votes
1answer
94 views

Is there a command which displays options like `errexit` and `braceexpand` other than `help set`?

If you type help set, then - among other things - a list of shell options is displayed. But these options are not the same as those displayed with shopt. And different also from those displayed with ...
24
votes
3answers
2k 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 ...
8
votes
4answers
10k views

Prevent SSH client passing TERM environment variable to server?

I'm currently using Fedora 18 gnome-terminal, then started tmux multiplexer in it. After I connected to a CentOS 5 server via ssh command, I find: ls result has no color tmux, screen, hexedit, htop ...
1
vote
2answers
99 views

Toggle/macro/xargs-like thing for shell variables

So I'm stuck doing a lot of cross-compiling and am typing stuff like this a lot FOO=bar command --some-args BAZ=qxt other-command --other-args But obviously the real shell variables are long and ...