Shells, Processes, and Environment Variables

Fri, 02 Oct 2026 09:00:00 +0100

You ask Pi to run ll, and it reports ll: command not found. You try the same command in your interactive terminal, and it works. Pi ran the command in a separate non-interactive shell, where your alias may not be defined or expanded.

shell-aliases.md states the cause in the first line: Pi starts a separate non-interactive shell process for each Bash command. Non-interactive Bash does not expand aliases by default and usually does not load the same startup files as an interactive terminal.

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Shells, Processes, and Environment Variables