Environment Variables in Shell

Fish Shell is preferred to Bash/Zsh. The following content is for Bash/Zsh only.

export¶

A new child process forked from a parent process does not inherit parent’s variables by default. The export command marks an environment variable to be exported with any newly forked child processes and thus it allows a child process to inherit all marked variables.

unset¶

References¶

https://stackoverflow.com/questions/6877727/how-do-i-delete-an-exported-environment-variable