which

Overview ¶

Package which implements the `which` built-in.

Resolution order:

1. If the command is in the dispatch Registry, print /usr/bin/<name> (or whichever stub directory matches first in $PATH). This makes `which X` work for built-ins exactly like coreutils against /usr/bin entries.
2. Otherwise walk $PATH (defaulting to "/usr/bin:/bin") and return the first executable found on the VFS.
3. If nothing matches, exit 1 with no output.

Flags:

-a  print every match, not just the first
-s  silent: no output, just set the exit code