How do I delete an exported environment variable?
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Before installing gnuplot, I set the environment variable
GNUPLOT_DRIVER_DIR = /home/gnuplot/build/src. During the installation, something went wrong.
I want to remove the
GNUPLOT_DRIVER_DIR environment variable. How can I achieve it?
unset is the command you're looking for.
How do I delete an exported environment variable?, SUMMARY This article explains how to delete environment variables for supported versions of Windows, Mac and Linux. MORE How to delete (unset) an exported environment variable ? - When deleting either user or system variables, you may need to log off and on again before your changes to environment variables take effect.
Walkthrough of creating and deleting an environment variable in bash:
Test if the DUALCASE variable exists:
el@apollo:~$ env | grep DUALCASE el@apollo:~$
It does not, so create the variable and export it:
el@apollo:~$ DUALCASE=1 el@apollo:~$ export DUALCASE
Check if it is there:
el@apollo:~$ env | grep DUALCASE DUALCASE=1
It is there. So get rid of it:
el@apollo:~$ unset DUALCASE
Check if it's still there:
el@apollo:~$ env | grep DUALCASE el@apollo:~$
The DUALCASE exported environment variable is deleted.
Extra commands to help clear your local and environment variables:
Unset all local variables back to default on login:
el@apollo:~$ CAN="chuck norris" el@apollo:~$ set | grep CAN CAN='chuck norris' el@apollo:~$ env | grep CAN el@apollo:~$ el@apollo:~$ exec bash el@apollo:~$ set | grep CAN el@apollo:~$ env | grep CAN el@apollo:~$
exec bash command cleared all the local variables but not environment variables.
Unset all environment variables back to default on login:
el@apollo:~$ export DOGE="so wow" el@apollo:~$ env | grep DOGE DOGE=so wow el@apollo:~$ env -i bash el@apollo:~$ env | grep DOGE el@apollo:~$
env -i bash command cleared all the environment variables to default on login.
Deleting an exported environment variable, Sometimes you want to completely remove the variable from the environment. In order to remove or unset a variable from the environment, you Delete (or Unset) an Environment Variable Sometimes you want to completely remove the variable from the environment. In order to remove or unset a variable from the environment, you can again use the env command with the –unset (-u) command line option.
Because the original question doesn't mention how the variable was set, and because I got to this page looking for this specific answer, I'm adding the following:
In C shell (csh/tcsh) there are two ways to set an environment variable:
set x = "something"
setenv x "something"
The difference in the behaviour is that variables set with setenv command are automatically exported to subshell while variable set with set aren't.
To unset a variable set with set, use
To unset a variable set with setenv, use
Note: in all the above, I assume that the variable name is 'x'.
How To Set and Unset Environment Variables on Linux , How to delete (unset) an exported environment variable ? - When deleting either user or system variables, you may need to log off and on again before your remove this env variable and restart installation? Deleting an exported environment variable . 0 votes. While setting up gnuplot, I set the envirnment variable:
this may also work.
Q100127: How to delete/unset environment variables – Foundry, I do not want to delete or unset an exported environment variable. How do I run a program in a temporary environment in bash or ksh shell? You Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. How do I delete an exported environment variable? 879
As mentioned in the above answers,
unset GNUPLOT_DRIVER_DIR should work if you have used
export to set the variable. If you have set it permanently in
~/.zshrc then simply removing it from there will work.
how to view, edit, unset and delete an environment variable in linux , Use unset command to delete the variables during program execution. It can remove both functions and shell variables. The syntax is: Command Line. If you want a specific environment variable, then just type the name of it (e.g. PATH ), followed by a >, and the filename to write to. The following will dump the PATH environment variable to a file named path.txt. C:\> PATH > path.txt.
linux, To remove the LD_LIBRARY_PATH_64 variable, execute the command: unset LD_LIBRARY_PATH_64. csh. unsetenv <environment variable> Others have answered that export makes the variable available to subshells, and that is correct but merely a side effect. When you export a variable, it puts that variable in the environment of the current shell (ie the shell calls putenv(3) or setenv(3)). The environment of a process is inherited across exec, making the variable visible in subshells.
How To: Temporarily Clear Bash Environment Variables on a Linux , Delete, of course, enables you to delete the selected environment variable. Save any changes that you make by clicking OK. Under the Environment Variables window, choose or highlight the PATH variable in the System Variables section shown in the window.
How to undefine and unset a bash environment variable on Linux or , Use unset command to delete the variables during program execution. It can remove both functions and shell variables.
- For those looking for how to do this in Fish shell see stackoverflow.com/questions/30703860/… (even though this question isn't for a specific shell)
- but this only works for a session, what about unsetting it definitely? or maybe searching where is the variable set, so you can go and delete it?
- This should work per terminal instance. Generally, each time a terminal window is opened, it will load up variables from various places such as ~/.bashrc, ~/.profile, etc. Any variables you set in one terminal instance will not carry over to another. If you have a variable which seems to be set automatically every time you open terminal, try looking through the various hidden files in your home directory for it. Or, to see where it is being set, try "grep -r <X> ~" where <X> is the name of the variable. This may take a while if you have a lot of files in your home directory.
- This removes the variable from the shell too though. Is the only way to
T="$MYVAR"; unset MYVAR; MYVAR="$T"; unset T?
- @olejorgenb At least in bash, you can say
declare +x MYVARto remove the export but keep the value in the current shell.
export -n MYWARworks as well in Bash.
echo $VARIABLEis better than
env | grep VARIABLE, it's lighter as it doesn't need to print all variables and then send its output to another (grep) process. Plus,
env | VARIABLEcould catch more than one variable that matches the same pattern. Plus2,
echo $VARIABLEmakes possible to complete variable's name by hitting <Tab> (if it exists, that also may be a hint to what you wanna do).
- 'env | grep VARIABLE' is better than 'echo $VARIABLE' because I can tell it's truly gone
echo $VARIABLEdoesn't tell you whether the VARIABLE is a shell variable (here called "local variable") or an environment variable, which is the whole point of the walkthrough.
- Note that
env -i bashseems to be creating a subshell (at least on a Mac) which may have unintended consequences.
- @RodrigoGurgel using echo won't show existing variable set to empty string or nul. to your point, though, a proper way to test for variable would be
env | grep -e '^VARNAME='.
- Great addition about the differences between set / setenv wrt subshells!
- The variable still exists, but it contains an empty string, as you can see in the output of the
envcommand. It just might be the case that the application that uses the variable does not distinguish between non-existent and empty environment variable.
- yes it will contain, this was just to remove value not to remove variable. But yes one can use - unset GNUPLOT_DRIVER_DIR.
- This doesn't work in the case of the PAGER variable. I tried to unset my PAGER setting with
export PAGER=, but that just disabled paging entirely--all my man pages just dumped straight to the terminal.
unset PAGERdid the trick, reverting it to default behaviour.