General :: Which Environment Variables Not Inherited By Bash Shells
Jan 2, 2011
I am using Linux some years, but since I built a LFS, I feel noobish again. Now with the help of BLFS I am setting up my environment and somewhere I incidentally read, that not every variable is inherited by a child Bash shell. As for the $PS1 and $PS2 variables I know, that they are not inherited by non-interactive Bash shells (and there is no reason why they should in my opinion). Well, as for my first thread I hope the title gives enough information on what I want to know. But anyways: Which environment variables are not inherited by Bash shells?
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Jul 23, 2010
For example, if I'm in csh, I can use `setenv VARNAME varVALUE` while I can use export in Bash. Given that the environmental variables are created, can BASH read env vars from csh and vice versa?
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Nov 9, 2010
How do I concatenate two environment variables in bash?
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May 5, 2010
I am trying to figure out where variables are set for interactive shells? In particular, I am trying to have LS_OPTIONS inherited by interactive shells as it is by login shells. I understand LS_OPTIONS is set in /etc/profile, and this may not be processed by interactive shells but by login shells. However, I also note other variables such as PATH and INPUTRC are set correctly in interactive shells, and these are also set in /etc/profile from what I understand. So how is it determined which variables are inherited by all shells, and which are just for login shells?
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May 20, 2010
I am running Red Hat Linux Enterprise 5; I am always using the export command to set environment variables.Are there any other ways to set environment variables and what are the advantages/disadvantages of them?
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Jun 21, 2010
he $g09root is picked up ( in both the csh and the bash), but not the $GV_DIR or the $GAUSS_SCRDIR. I guess it's some stupid error, but it is highly frustrating.Here is the .profile file:Quote:
# To make use of this feature, simply uncomment one of the lines below or
# add your own one (see /usr/share/locale/locale.alias for more codes)
#
[code]...
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Jun 2, 2010
I know many people have asked about environment variables before, but I am having a hard time dealing with these paths while ensuring I don't mess around with the original settings. How would you go about executing these commands in Ubuntu in terms of environment variables?
put /home/stanley/Downloads/ns-allinone-2.34/bin:/home/stanley/Downloads ns-allinone-2.34/tcl8.4.18/unix:/home/stanley/Downloads/ns-allinone-2.34/tk8.4.18/unixinto your PATH environment; so that you'll be able to run itm/tclsh wish/xgraph.
IMPORTANT NOTICES:
(1) You MUST put
/home/stanley/Downloads/ns-allinone-2.34/otcl-1.13,
/home/stanley/Downloads/ns-allinone-2.34/lib,
into your LD_LIBRARY_PATH environment variable.
[Code]....
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Sep 4, 2010
I am running an application which requires setting environment variables to be set.At the moment, the way I am achieving this is by exporting the EV at the command line, and then running the app from the command line.I want to be able to run the app from my menu (it is already a menu item after I installed it).How may I set the env var so that it is always available, so I can just run the app from the menu instead of from the CLI?
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Apr 16, 2011
I am trying to include my directory /usr/sbin in it's serch path for executable files using an environment variable. Would the input be: PATH="/usr/sbin"? And also upon start up, my shell should create the PRINTER environment variable which should resolve to the word sales...would that input be: PRINTER="sales"? If someone could help me with these two questions,
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Jul 13, 2010
I have bunch of environment variables that i have to set always for my work.Someone mentioned i can write a script to dp this and i googled it but haven't been successful so far and have to manually do them every time. I have a tcsh shell.I read that i need to change the .login or .tcshrc files but havent been successful in finding these.
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Jun 15, 2010
I can setup variables in ~/.bashrc for my own shells. I can also setup variables globally in /etc/bashrc.but then how do I setup variables for a group in Linux? So that users who belong to this group will see the variables, but not others?
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Oct 27, 2010
I want to export the env variables in a file using a script,i tried using the below:for var in 'env'
do
var2=env|awk -F '=' '{print$1}'
echo "$var;export $var2">file.txt
[code]...
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Mar 18, 2010
I'm looking for a way to set arbitrary environment variables for my graphical login on linux. I am not talking about starting a terminal and exporting environment variables within the terminal, because those variables only exist within that one terminal. I want to know how to set an environment variable that will apply to all programs started in my graphical session.
In other words, what's the Xorg equivalent of ~/.bash_login?
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Jun 2, 2011
I have been give a task of replicating one of our production systems to create a test system. I have been restricted to use c shell to set up its environment variables. I am new to this my questions is how do i set environment variables for a particular user on c shell e.g ORACLE_HOME and ORACLE_SID permanently for a particualar user i know in bash you edit the .bash_profile file. What do i do for c shell?
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May 21, 2010
Sometimes it is possible to trick a Linux app by calling it like this:
HOME=/tmp/foo myapp
This would make myapp think /tmp/foo is the home directory, it won't try to get the user id, find its home directory via getpwent(). This is useful when myapp must be forced to dump some of its config files into a non-standard location different than ~.
A similar trick can be done like this: LANG=foo LC_ALL=bar myapp
This is useful when myapp needs to be called once with a different locale without having to make the change persistent by using the export bash built-in or even modify stuff in /etc/profile.
Is it possible to pull the same trick with time and date? The goal is to make an app use another time than the system ones. The final goal - to make timestamps that appear in logs/commit messages not being tied to the system time.
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Aug 25, 2011
I was using the command export, but it looks that after some time the set variables disappears. What is the easiest way of setting an environment variable forever?
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Sep 22, 2011
I often need to change a small part of long environment variable (especially, e.g., paths), and do it either by pasting the thing into an editor and changing it there, or the equivalent.
Is there some small convenience utility to edit environment variables with a cursor on the command line?
I suppose I could always whip one up, but am hoping there's already something that I'm just not aware of.
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Apr 6, 2011
mkvmerge -o <filename without extension>_TV.mkv -S <filename> && mkvextract tracks <filename> 3:<filename without extension>.*** && perl /home/brian/Desktop/ass2srt.pl <filename without extension>.*** && rm <filename without extension>.***
Doing these commands for multiple command line file inputs is the goal. So I can just type ./script.sh *.mkv in my terminal.This is what I have so far, but it doesn't work whatsoever.
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Sep 13, 2010
Is there a difference when variables are referred to as $variableName and ${variableName} in bash?
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Aug 12, 2011
I have $db and $DATE set in my bash script, then I need to join them like this: mysqldump --user=usr --password=pss --databases $db | gzip > /backups/sqlNew/$db_$DATE.sql.gz;
Unfortunately, that doesn't work. How do I properly join those 2 variables into a filename?
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Jan 23, 2010
I have a problem with a very big script I wrote in bash, and now I need to modulirize it in at least four smaller scripts. The problem is, that most of the variables I have will need to be shared by all scripts.
My question is: is there a way to declare global variables in bash? So that I can use and change them in any of the scripts and every change in the variable can be "seen" by the other scripts later.
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Apr 4, 2011
I've created a script that put in dynamic variables the value HELLO 1, HELLO 2 HELLO 5. And I put the values of this variables in the file text.txt. Here's the script:
Code:
for i in $(seq 1 5); do eval ${i}=$(cat << EOF "HELLO" $i EOF); done
cat > text.txt << EOF
$1
$2
[Code]...
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Apr 18, 2011
Can I pass javascript variables to bash script? If possible in bash script what code should I insert to receive javascript variables.
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Aug 2, 2010
I would like to run a bunch of SQL commands from mysql client in bash. However, I would like to store the output in different variables. E.g.
Code:
var1=`mysql -u[user] -p[pass] -D[dbname] -e "Query1"`
var2=`mysql -u[user] -p[pass] -D[dbname] -e "Query2"`
[code]...
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Sep 7, 2011
I've been writing a bunch of bash scripts to make possible non-interactive, secure, cron-based SVN checkouts with CollabNet's SVN client and GNOME Keyring Daemon (aka GKD) and one of the scripts was designed to start GKD, harvest its output, essentially a couple of environment variables, and export those variables in shell of a user the script is run as. All upon user login by sourcing a bash script in ~/.bashrc.The problem is that those environment variables will not be exported, because the script is being run in a sub-shell that exits upon it completion and environment variables get unset for good.Well, the question is how can those variables be set permanently, meaning they're exported and kept untouched even across login-logout sessions?
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Jun 21, 2010
I have a user that has been used for long time now that runs o C Shell... now there is a need to change it to Bash Shell? Can I cause a problem changing his shell from C to bash? I mean apps or variables?
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May 18, 2010
I just installed valgrind on my Fedora12 machine.
$ valgrind // 1
$ valgrind: Command not found. //error
$ /usr/local/bin/valgrind // 2 works fine
[code]...
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Aug 23, 2015
I'm trying to compile Ardour on jessie amd64 using the Debian source code (there's already an ardour package but I want to use different compile options). I've applied the Debian patches and have all the required dependencies installed.
Scons quits with a KeyError message from python2.7 saying that os.environ['DEB_HOST_ARCH_OS'] is not defined.
Checking with 'dpkg-archtecture -l' shows that DEB_HOST_ARCH_OS=linux, but 'print os.environ["DEB_HOST_ARCH_OS"]' in python says that name 'os' is not defined. The scons script has 'import os' at the top so it should be seeing it.
How do I make this visible to python (I'm assuming this problem is specific to the jessie python2.7 installation and not python in general)?
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Oct 11, 2009
How do I edit my .bash_profile so recursive directories are on my path without manually typing all the directories? For example, I want to have /home/woodenbox/SU, /home/woodenbox/SU/bin, /home/woodenbox/SU/bin/src, etc on my path without actually having to write the paths for all the subdirectories
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May 3, 2011
How to set JAVA_HOME environment variables permanently such that it will not have to be set each time it has to be used.
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