How do I delete an exported environment variable

Question

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

User · Answer

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  unset x   To unset a variable set with setenv  use  unsetenv x   Note  in all the above  I assume that the variable name is  x    credits   https   www cyberciti biz faq unix-linux-difference-between-set-and-setenv-c-shell-variable  https   www oreilly com library view solaristm-7-reference 0130200484 0130200484 ch18lev1sec24 html

User · Answer

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    bashrc or    zshrc then simply removing it from there will work

User · Answer

unset is the command you re looking for   unset GNUPLOT DRIVER DIR

User · Answer

this may also work   export GNUPLOT DRIVER DIR

User · Answer

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

[linux] How do I delete an exported environment variable?

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