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

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Why lfs couldn't use original host environment variables?

From the lfs doc: The exec env -i.../bin/bash command in the .bash_profile replaces the running shell with a new one with a completely empty environment, except for the HOME, TERM, and ...
5
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1answer
2k views

How does 'screen' impact environment variables?

I noticed a difference in 'env' before and after a 'screen' call, is there any additional clarity on what gets called (for setting environment variables)? I couldn't see any clear explanation from ...
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2answers
970 views

How to change environment variables without re-logging to UI?

How can I change environment variables without re-logging to UI? I want to re/define some variables and want them set on my current logged in shell (including UI). I know logging out and then logging ...
6
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2answers
468 views

Run a script automatically as I switch to a directory [duplicate]

Possible Duplicate: Execute bash scripts on entering a directory I am running an environment which requires some very specific tool versions. The commands to set up the environment are in a ...
20
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2answers
10k views

How do I change the default text editor in the Debian (squeeze) distro

"Joe's own editor" does not come naturally to me. How do I change to using nano or vim? I've tried export EDITOR=nano but it doesn't seem to be respected. I'd like visudo to respect this as well.
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1answer
2k views

How can I set environment variable permanently through shell script?

Let's say I have a script: #!/bin/bash echo $1 if [[ ! $1 ]];then echo "True" fi export ABC="/home/aashish" ABC is not available after the execution of this script. How can I make that variable ...
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2answers
11k views

changing an environment variable like PATH forever [duplicate]

Possible Duplicate: How do I set a user environment variable? (permanently, not session) to change the amount of PATH variable , I use : export PATH=... but when I close the terminal, the ...
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2answers
13k views

How to set environment variable JAVA_HOME that will be saved on exit? [duplicate]

Possible Duplicate: How do I set a user environment variable? (permanently, not session) I use Suse. First was installed jdk7, so JAVA_HOME remains like: /usr/java/jdk1.7.0_05/ After I ...
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1answer
168 views

crontab sets up user variable, redirect output, and detect connetcted network

I have three problem, all of them are about crontab. Can I access $HOME variable in crontab ? for example, use $HOME like this: PATH=$HOME/bin:$HOME/scripts:$PATH ? or * * * * * echo "test" > ...
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1answer
1k views

How do you make DISPLAY variable undefined?

I am using Ubuntu, but I think this applies to all Linux. What's the command to set DISPLAY to be undefined in the shell?
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3answers
825 views

How can I restore the changes to shell variable?

For the purpose of an experiment... Suppose I did this bash="unset DISPLAY; export DISPLAY" so I can make DISPLAY undefined. How can I restore the original value set? Or at least know what it was? ...
20
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2answers
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What is the difference between ~/.profile, ~/.bashrc, ~/.bash_profile, ~/.gnomerc, /etc/bash_bashrc, /etc/screenrc …?

Answers to the questions on SO and askubuntu, along with poking through (and reading headers of) $HOME and /etc/, indicate a number of files that can be used to set environment variables, including: ...
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2answers
323 views

What is the difference between `terminator -e ranger` and ranger from terminal?

EDIT: I just noticed that when I hit Enter on the ranger (if it is executed with terminator -e ranger) then nano opens while with e it uses my main editor. In contrast, when I use a normal shell to ...
5
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2answers
1k 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 ...
7
votes
1answer
1k views

change environment of a running process

How might it be possible to alter some variable in the env of an already running process, for example through /proc/PID/environ? That "file" is read-only. Need to change or unset the DISPLAY variable ...
0
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1answer
219 views

Fedora 7 server export in .bashrc not getting set [duplicate]

I'm trying to set the JAVA_HOME environment variable in my .bashrc but every time I log back in it gets unset again to its original value, below is my .bashrc file # .bashrc # User specific aliases ...
2
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0answers
74 views

Envirnment variables for packages built in custom location

Some time ago (month or so) I started to install packages that I build from source in custom location ~/.local so that I can easily distinguish which I build from source, and for other reasons, ...
1
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1answer
2k views

Setting locale for user

I'd like to set a locale for my user different than system locale. By putting export LANG=en_US.utf8 in .bashrc I could do that for the shells, but still it's not working for applications not started ...
3
votes
2answers
1k views

sourcing a file inside a script

I'd like to source a file inside a tcsh script. In code: #!/bin/tcsh unsetenv LD_LIBRARY_PATH source $1 echo $LD_LIBRARY_PATH > temp_file The expected result: The environment variable set ...
1
vote
3answers
434 views

Accessing bash [internal] brace expansion iteration number/variable

Question: Is it possible to access which number of a bash iteration is currently being processed? Psuedo-Command mv {1..5}.something.{1..5} $x1.$x2.something Note: This is a logical ...
0
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2answers
111 views

Way to determine where certain global parameter is configured [duplicate]

Possible Duplicate: How to determine where an environment variable came from I wonder if there is a way to determine the location of the file where certain configuration exists. For example ...
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2answers
3k views

Trying to set JAVA_HOME in ~/.bashrc

I have added this line at the end of ~/.bashrc export JAVA_HOME=/usr/java/jdk1.5.0_07/bin/java But when I execute echo $JAVA_HOME, I don't get anything as output, I expected ...
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2answers
2k views

How to make changes to /etc/profile take effect

I am trying to change $GRAILS_HOME from /usr/grails-1.3.7 to /usr/grails-2.0.0 If I just do export GRAILS_HOME=/usr/grails-2.0.0 it doesn't persist when I log out and back in. I found a line in ...
1
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1answer
242 views

Why `which tmux` and `sudo which tmux` return 2 different values?

ssh bobby@tony:~$ which tmux /usr/bin/tmux ssh bobby@tony:~$ sudo which tmux ...
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4answers
480 views

Exporting environment variable

I am having some problem with bash. I want to export an environment variable whose value contains a variable but I don't want that variable (which is within the value) to be evaluated during the ...
1
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2answers
241 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
301 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
352 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 ...
1
vote
2answers
525 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 ...
5
votes
2answers
4k 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%=*} ...
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votes
4answers
3k 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 ...
11
votes
2answers
4k 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?
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1answer
2k 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 ...
9
votes
3answers
5k 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 - ...
12
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3answers
6k 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?
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2answers
331 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
2k 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 ...
2
votes
2answers
390 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
1k 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 ...
9
votes
4answers
8k 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
526 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 ...
15
votes
6answers
27k 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 ...
10
votes
4answers
8k 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?
6
votes
2answers
13k 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
78 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
2k 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 ...
5
votes
3answers
10k 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 ...
90
votes
4answers
145k views

How to correctly add a path to PATH?

I'm wondering where a new path has to be added to PATH environment variable. I know this is accomplished editing .bash_rc (for example), but it's not clear how to do this. This way: export ...
2
votes
1answer
158 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
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0answers
297 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?