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

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2answers
463 views

Variable name from command output

I have some string, and want to split on colon ":" assigning on variable with name from left part and value from right part. For example: echo "Title: Some title" | sed 's/:.*//' gives me wanted ...
7
votes
1answer
436 views

How set environment variable based on whether a GUI is available?

How can I set up my .bashrc such that the value of an environment variable changes based on whether or not the current session has access to the gui / windowing system? For example, let's say I have ...
0
votes
1answer
784 views

Shell script executing in the terminal but not from shell script file [duplicate]

Possible Duplicate: How can I make variables “exported” in a bash script stick around? I have a problem with executing script from file. When I type in command line PATH=$PATH:/...
3
votes
2answers
2k views

Checking if PATH contains $HOME/mydir and adding it if not (all in a script) [duplicate]

Possible Duplicate: keep duplicates out of $PATH on source I am not an expert with Unix scripting. Some of my scripts are located in $HOME/mydir. Unfortunately, they are not accessible from ...
8
votes
3answers
7k views

Set Variable Environment Variables in bash (or other)

I want my script to read a file containing key/value pairs of environment variables to set, and then to set them. So far, I have this: #!/bin/bash cat $1 | while read kv do key=${kv%=*} val=...
11
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4answers
5k views

Adding paths to PATH using a multi-line syntax

As far as I understand, the usual way to add a path to the PATH environment variable is by concatenating paths separated by the : character. For example, if I want to add three paths to it /my/path/...
15
votes
2answers
8k views

In zsh how can I list all the environment variables?

I want to get a list of all environment variables (shell variables? exported variables?) and their values at a given time, in zsh. What is the proper way to do this?
17
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1answer
21k views

How can I make variables “exported” in a bash script stick around?

I have multiple Amazon EC2 accounts and want to quickly be able to switch variables, such as $EC2_HOME, using a script. I have have a shell script set up like this: #!/bin/sh export EC2_HOME=/home/...
22
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3answers
18k 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 - ...
20
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3answers
19k views

How to read environment variables of a process

Linux's /proc/<pid>/environ does not update (as I understand it, the file contain the initial environment of the process). How can I read a process's current environment?
1
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2answers
610 views

What are the key differences between $ENV_VAR and `env_var`?

It's a quite simple asked question I think: What are the key differences between using environment variables just like $HOSTNAME and `hostname`. Where is which appropriate, why are there two ...
3
votes
2answers
3k views

Why isn't my environment variable visible from the command line?

I'm trying to run the James SMTP server on Lion (Mac OS X 10.7.2). When I do this: sudo JAVA_HOME=/Library/Java/Home ./james-2.3.2/bin/run.sh it works fine. However, I'd like to make JAVA_HOME an ...
4
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2answers
1k views

Is there a difference between setting an environment variable to the empty string and unsetting it?

Is there any practical difference between unsetting an environment variable and setting it to the empty string?
5
votes
2answers
2k views

Send a command to a running tmux session (like screen -X)

I'm looking to switch from screen to tmux for my terminal multiplexing needs, but there's a feature of screen that I need to replicate in tmux: the -X option, which allows one to run arbitrary screen ...
20
votes
4answers
26k views

What scopes can shell variables have?

I just ran into a problem that shows me I'm not clear on the scope of shell variables. I was trying to use bundle install, which is a Ruby command that uses the value of $GEM_HOME to do its work. I ...
2
votes
4answers
961 views

Update Linux Path permanently [duplicate]

Possible Duplicate: How do I set a user environment variable? (permanently, not session) How can I permanently modify the PATH variable in Ubuntu? Is it possible to do it without modifying any ...
43
votes
10answers
83k views

How can I run a cron command with existing environmental variables?

How can I run a cron command with existing environmental variables? If I am at a shell prompt I can type echo $ORACLE_HOME and get a path. This is one of my environmental variables that gets set in ...
14
votes
5answers
28k views

Script to change current directory (cd, pwd)

I want to run a script to simply change the current working directory: #!/bin/bash cd web/www/project But, after I run it, the current pwd remains unchanged! How can I do that?
30
votes
3answers
49k views

Refresh env variables after editing bashrc file

I frequently edited the .bashrc file to export new environment variables. Rather than close the console and start a new one to refresh the env variables, is there a convenient way to refresh?
2
votes
0answers
85 views

How to get environment variables to persist across login? [duplicate]

Possible Duplicate: How do I set a user environment variable? (permanently, not session) For a project I'm working on, I have a service that runs at startup which calls a script to set ...
2
votes
1answer
3k views

Why my $PATH is not inherited by the invoked bash?

I work on an AIX system where I have no administrator privileges. It has several shells installed, default being tcsh. I am not allowed to change the login shell. Usually I start my session from exec ...
11
votes
3answers
27k views

How to set global environment variables at boot through a script, and have them available for an application that runs before login?

I have a service that runs at boot, and in that service it calls a bash script in the background that exports some environment variables. The problem I'm having is that those environment variables ...
389
votes
8answers
732k views

How to correctly add a path to PATH?

I'm wondering where a new path has to be added to the PATH environment variable. I know this can be accomplished by editing .bashrc (for example), but it's not clear how to do this. This way: export ...
3
votes
1answer
186 views

Why does this variable have no value even though it is set in .bashrc?

If I append this: hi=11 export hi to the .bashrc and then I su to this user with: su - bela then I: echo $hi 11 Then it's working, the "hi" variable has the value of "11". But. When I: ...
0
votes
0answers
309 views

Why do you need sudo for “sudo su root”? [duplicate]

Possible Duplicate: When do su and sudo use different passwords? Why do you need to use sudo su root ? Why won't it work to just use su root?
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 ...
9
votes
5answers
10k views

Run script in a non interactive shell?

I have a cron job that is running a script. When I run the script via an interactive shell (ssh'ed to bash) it works fine. When the script runs by itself via cron it fails. My guess is that it is ...
5
votes
2answers
8k views

How to get a clean environment in a ksh shell?

I need to get rid of all the environment variables in a Ksh shell. I can fork a new instance, but it will inevitably source some init files (as far as I know .profile, .kshrc). Is there a way to ...
5
votes
2answers
3k views

(G)VIM uses a different $PATH than my system

Because Ubuntu provides no up-to-date packages for TeXLive, I installed it manually. However, some programs need TeXLive as dependency. So what I did is I installed the TeXLive package from the Ubuntu ...
2
votes
2answers
717 views

Function to evaluate variables in BASH

Given a variable name is there a function that will print its value? Often times I pass the name of a variable to a bash function and instead of doing the expansion while passing it I would like to ...
11
votes
2answers
33k views

How to alter PATH within bash script?

I have several projects that require me to change versions of Java/Grails/Maven. I'm trying to handle this with some Bash scripts that would make the changes. For example: #!/bin/sh export JAVA_HOME=...
1
vote
1answer
247 views

How do I change the path used by the Gnome Command Line applet?

For my shell, I know that I have to modify .bashrc to add my ~/bin directory to the command path, but how do I get the Gnome Command Line applet to use that as a program location too? I'm using v2.13....
5
votes
3answers
383 views

For a same unix or linux user, different sets of environment variables

I'm using tcsh, and for a specific project every member of my team connects to a server with the same user. (This is something we cannot change). The situation arises because I want to have some ...
3
votes
1answer
3k views

pass 1 environment variable using sudo

Is this a correct way for passing an environment variable in sudo ? sudo -u www-data -b env FOOBAR="foobar" /home/user/folder/daemon
0
votes
1answer
670 views

Variable assignment in .bash_profile has no effect

I added the following to my .bash_profile: JAVA_HOME=$JAVA_HOME:/usr/java/jdk1.7.0 export JAVA_HOME However, when I echo $JAVA_HOME it outputs an empty string. Why weren't my changes to ....
5
votes
4answers
2k views

Last failed command in bash

The $? variable holds the exit status of last run command. Is there a variable that holds last run command itself?
76
votes
5answers
208k views

How do I set a user environment variable? (permanently, not session)

This is irritating me. I seen several suggestions (all using different files and syntax) and none of them worked. How do I set an environment variable for a specific user? I am on debian squeeze. ...
7
votes
5answers
680 views

PATH environment variable in linux [duplicate]

I want to know how the standard environment variables given by the linux OS like PATH, HOME are set automatically. In which file are these read from. There should be some file from which these ...
5
votes
2answers
3k views

How to run a cronjob in my regular environment?

Both the shell and environment variables that cronjobs are run in is completely different from the ones presented to me in gnome-terminal. How can I run a cronjob under the same circumstances as if I ...
4
votes
3answers
166 views

How can I make a public variable in Linux that all users would see?

I need to have a variable $FOO on the system that contains a string all users could use, but I have no idea how to create one. The Upstart job is obviously not a solution as from this thread - Is it ...
5
votes
3answers
8k views

Is it possible to export env variable via Upstart?

I need to export a variable FOO=stringhere so that system processes could use it. And the place I would like to do this, is Upstart job. Unfortunately, I tried as per Upstart manual to do env FOO=...
4
votes
3answers
387 views

Need help deciphering unix statement

I need help deciphering what is being said here: export IP=`/sbin/ifconfig | grep 'inet addr:'|grep -v '127.0.0.1'| cut -d: -f2 | awk '{print $1}'` I know it is to set IP as an environment ...
4
votes
2answers
190 views

Why do newlines mess up my while condition?

I have a while loop that allows setting variables when written one way but does not allow it when written another way. Why is that? This prints var as 1234 and does not print var2 #!/bin/bash var=...
8
votes
2answers
3k views

In `while IFS= read..`, why does IFS have no effect?

I might have something absolutely wrong, but it looks convincing to me, that setting IFS as one of the commands in the pre-do/done list has absolutely no effect. The outer IFS (outside the while ...
54
votes
4answers
38k views

Why is `while IFS= read` used so often, instead of `IFS=; while read..`?

It seems that normal practice would put the setting of IFS outside the while loop in order to not repeat setting it for each iteration... Is this just a habitual "monkey see, monkey do" style, as it ...
2
votes
2answers
405 views

How do you set an environment variable?

Please explain how to set environment variables. I need to point an environment variable to a xml file.
5
votes
2answers
4k views

Tell pkg-config to look *.pc files also in /usr/local/lib/pkgconfig, system-wide

Right now pkg-config looks only in /usr/lib/pkgconfig. I can adjust it for a user by exporting the PKG_CONFIG_PATH environment variable, but once again I forgot to do it for root and wasted time ...
9
votes
1answer
3k views

Where have I set my bash PATH?

I want to remove ~/bin from my PATH.  I set it up months ago when Linux (Ubuntu) was very new to me, but I don't know how I added it... Nothing shows up when I search all the files listed below. ...
3
votes
3answers
1k views

Easy way to restore your MANPATH

I was attempting to add the man pages for my texlive distribution today when I accidentally did this: $ MANPATH=MANPATH:/usr/local/texlive/2011/texmf/doc/man $ export MANPATH ...when I meant this: ...
5
votes
2answers
6k views

Exception of inheritance of environment variables

Quoted from Wikipedia: By default, when a process is created it inherits a duplicate environment of its parent process, except for explicit changes made by the parent when it creates the child....