6
votes
3answers
125 views
+100
Why do I have to re-set env vars in tmux when I re-attach?
I mainly work on a mac and ssh/tmux attach to a Linux machine to do my work. I have ssh-agent running on the Linux machine. I have
set -g update-environment "SSH_AUTH_SOCK SSH_ASKPASS WINDOWID ...
2
votes
1answer
24 views
Installing packages and tools on a local non-standard directory
TLDR: What environment variables should I update to guarantee that my system has access to everything a package provides when building it on a non-traditional path?
I usually don't have root access ...
1
vote
2answers
108 views
OS X setting environment variables
I have OSX 10.8.2 with ZSH as my shell and iTerm as a terminal (don't know if the last thing is relevant). I have to mention that I'm relatively new to OSX.
I'm trying to set up some environment ...
2
votes
1answer
250 views
How to run Steam from the Xfce desktop?
I've installed Steam on Debian 7.0 without any hassle, and I can run it by typing steam &.
I've set it as a desktop launcher in Xfce, but when I ran it, nothing happened.
Then I've check the ...
0
votes
1answer
159 views
difficalty to save traceroute output in shell variable?
I need to filter and store traceroute output in shell variable (array). But I am getting some unusual output.
As I try to explain in following lines.
My present directory is temp, having some ...
0
votes
3answers
164 views
What is the difference between '.' and 'source' in shells? [duplicate]
Possible Duplicate:
running script with “. ” and with “source ”
I have used both the dot command '.' and 'source' to reload a given rc file (typically to update my environment variables) ...
2
votes
2answers
69 views
Can I change the shell used to run GUI applications from a Desktop Manager?
A bit of background
I'm a developer and I install most of my tools in my home folder. So my shell's rc file is full of JAVA_HOME, GROOVY_HOME, MAVEN_HOME, ... variables. To expose all these ...
1
vote
3answers
673 views
How do I set an environment variable on the command line and have it appear in commands?
If I run
export TEST=foo
echo $TEST
It outputs foo.
If I run
TEST=foo echo $TEST
It does not. How can I get this functionality without using export or a script?
9
votes
1answer
225 views
How do you set up the environment for es?
I've been playing with es the last couple of days, and it (like rc) has the quirk/feature that it only runs its startup script (.esrc) on login. The usual way to run code in each interactive session ...
3
votes
2answers
518 views
Why $SHELL doesn't change when I run new shell?
$ echo $SHELL
/bin/bash
$ /bin/ksh93
$ echo $SHELL
/bin/bash
$ file /bin/ksh93
/bin/ksh93: ELF 64-bit LSB executable, x86-64, version 1 (SYSV),
dynamically linked (uses shared libs), for ...
3
votes
1answer
196 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?
1
vote
3answers
251 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?
...
1
vote
2answers
219 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 ...
0
votes
2answers
934 views
Trying to set JAVA_HOME in ~/.bashrc
I have added this line at the end of ~/.bashrc file.
export JAVA_HOME=/usr/java/jdk1.5.0_07/bin/java
But when I do echo $JAVA_HOME I don't get anything as output, I expected ...
0
votes
1answer
182 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
...
8
votes
2answers
2k 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?
5
votes
1answer
479 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 ...
1
vote
2answers
227 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 ...
7
votes
3answers
10k 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 ...
2
votes
0answers
75 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 ...
5
votes
4answers
2k 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 ...
4
votes
2answers
2k 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
3answers
230 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 ...
1
vote
1answer
535 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
4
votes
4answers
454 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?
4
votes
2answers
119 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
...
3
votes
2answers
367 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 ...
17
votes
4answers
5k 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
3answers
198 views
Source (.) piped curl output
I have a file, f, on my webserver with the following contents:
alias ll='ls -l'
I would like to (from another linux box) do the following, but I can't get the command right:
curl http://myserver/f ...
8
votes
2answers
1k 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 ...
3
votes
1answer
126 views
Why first set a variable and then export it instead of setting and exporting in one command?
If gpg-agent is executed, it outputs data that can be processed by a shell directly, e.g.:
SSH_AUTH_SOCK=/tmp/ssh-apeOFqMF3292/agent.3292; export SSH_AUTH_SOCK;
SSH_AGENT_PID=3293; export ...
2
votes
2answers
899 views
Is there a way to push shell config information when SSHing to a host?
I know how to set the GNOME-terminals (or xterms!) prompt to green/red regarding the last exit code:
vi .bashrc
export PROMPT_COMMAND='PS1="`
if [[ \$? = "0" ]];
then echo "\\[\\033[0;32m\\]";
else ...
6
votes
1answer
2k views
How to reset a shell environment?
This issue has been bugging me for a while, and although I've taught I've found my answer through EnvWatcher, unfortunately it only works on Bash. And I use zsh.
I would like to replicate the things ...
1
vote
4answers
634 views
How to run my C program from anywhere within the System (Ubuntu 10.10)?
Friends,
I want to add my C program's path to the environment variable PATH. My C program called "md5". So that I can execute it from anywhere (i.e any directory).
My md5 program is located at ...
1
vote
4answers
248 views
linux shell global linux memory in mem variable - from shell
Is there any way for me to set an env variable without editing files to be in memory and effect other shells as well, which will take effect on any new user who connects that machine and will take ...
5
votes
4answers
7k views
Export an env variable to be available at all sub shells, and possible to be modified?
Suppose I have
export MY_VAR=0
in ~/.bashrc.
I have an opened gnome terminal, and in this terminal, I change $MY_VAR value to 200. So, if I do
echo $MY_VAR
in this terminal, 200 is shown.
Now, ...
6
votes
2answers
963 views
How do you make RPROMPT in zsh update itself on every enter?
My RPROMPT is set to display svn info using vcs_info. It reads RPROMPT=${vcs_info_msg_0_}. vcs_info is called using precmd(). However, RPROMPT doesn't update when I change directories. It works only ...
4
votes
3answers
2k views
Can I spawn a new terminal that is a clone of the current terminal?
So let's say I'm developing code in directory /asdf/qwer/dfgh/wert/asdf/qwer and I've added about three more directories like that to my path and I have a bunch of arcane environment variables set. ...
10
votes
4answers
541 views
keep duplicates out of $PATH on source
I have the following code that's source-d by my .shellrc
PATH="${PATH}:${HOME}/perl5/bin"
PATH="${PATH}:${HOME}/.bin"
export PATH
but if I make changes to other code and then source this file, my ...
23
votes
2answers
1k views
$VAR vs ${VAR} and to quote or not to quote
I can write
VAR=$VAR1
VAR=${VAR1}
VAR="$VAR1"
VAR="${VAR1}"
the end result to me all seems about the same. Why should I write one or the other? are any of these not portable/POSIX?
11
votes
1answer
2k views
Difference between environment variables and exported environment variables in bash
Bash seems to differentiate between variables which have been exported and those which have not.
example:
$ FOO=BAR
$ env | grep FOO
$ set | grep FOO
FOO=BAR
set sees the variable but env does ...
15
votes
5answers
422 views
How to determine where an environment variable came from
I have a linux instance that I set up some time ago. When I fire it up and log in as root there are some environment variables that I set up but I can't remember or find where they came from. I've ...
