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by stragies 2442 days ago
On (at least) Debian systems (, and probably many more) `ls` is not a built-in, but an external binary (`/usr/bin/ls`) is used.

`which ls` and `help ls` will show you, if it is similar on your system.
1 comments
imihai1988 2442 days ago
It does't need to be a built-in to have a man page (many first party and third party libraries come with their own man pages).
link