[ls] undocumented exit (return) value

[Pascal A. Dupuis]

Hello,

I found by trial-and-errors that 'ls' from coreutils returns a status
which is not zero in case of problems like no file matching a given
pattern. I think such cases should be documented in the man and info
pages, to clarify exactly which situations lead to such a non-zero
exit status.

I use coreutils version 5.0 on a Debian-Sarge installation.

Best regards 

Pascal Dupuis

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