fish

The Friendly Interactive SHell, a command-line interpreter designed to be user friendly. More information: https://fishshell.com/docs/current/cmds/fish.html.

• Start an interactive shell session:

fish

• Start an interactive shell session without loading startup configs:

fish {{[-N|--no-config]}}

• Execute specific commands:

fish {{[-c|--command]}} "{{echo 'fish is executed'}}"

• Execute a specific script:

fish {{path/to/script.fish}}

• Check a specific script for syntax errors:

fish {{[-N|--no-execute]}} {{path/to/script.fish}}

• Execute specific commands from stdin:

{{echo "echo 'fish is executed'"}} | fish

• Start an interactive shell session in private mode, where the shell does not access old history or save new history:

fish {{[-P|--private]}}

• Define and export an environmental variable that persists across shell restarts (builtin):

set {{[-U|--universal]}} {{[-x|--export]}} {{variable_name}} {{variable_value}}