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

Parse Arguments in Bash¶

Environment Variables¶

export

unset

Tips and Traps¶

1. explainshell.com is a great place for learning shell.

2. Bash-it/bash-it is a great community driven Bash framework.

3. It is suggested that you avoid writing complicated Bash scripts. IPython is a much better alternative.

4. Do NOT use ; to delimit paths passed to a shell command because ;

By default, variables defined in a function are global, i.e., they are visible outside the function too.

1. Do NOT get into this messy shit if you can avoid it! Use Python script instead if you can.

2. If you want to reliably get the name of a Bash script, it is recommended that you run the Bash script as an executable script instead of source it in.