>Usage
The unset command in Unix is used to remove or clear shell variables and functions.
It deletes a specified variable or function from the environment, making it no longer accessible in the current shell session.
>Synopsis
>Options
-f
Removes a function definition rather than a variable. This is useful if you've defined a function in the shell and want to remove it.
Example:
-zsh
> unset -f my_function
Trying to call my_function after it has been unset results in the following error:
my_function: command not found
The function is no longer defined in the current shell session.
-v
Tells the shell to remove a variable. This option is often used to clarify that you’re deleting a variable rather than a function.
Example:
-zsh
> unset -v my_variable
Trying to call my_variable after it has been unset results in no output or an empty value.
-x
It will remove the variable from the environment of the current shell session, making it unavailable to subprocesses.
Example:
-zsh
> unset -x my_variable
Without unset -x: removes the variable but it might still exist locally within the shell session.
With unset -x: ensures the variable is completely removed from both the current shell and the environment of any subprocesses.