From: Masahiro Yamada
> Sent: 15 May 2019 18:55
...
> > xargs basename -a -- | sort | ...
>
> Sorry for my ignorance, but could you
> teach me the effect of "--" ?
>
> I sometimes use "--" as a separator
> when there is ambiguity in arguments
> for example, "git log <revision> -- <path>"
>
> In this case, what is intended by "--"?
The '--' stops getopt() from parsing any more parameters.
Useful things like 'grep -- -q' which will search for the
string '-q' rather than treating it as a command line option.
This is all made more horrid by a decision by the writers
of glibc getopt() to 'permute' argv[] so that 'options'
can follow 'nonoptions' ie it converts:
prog file -arg
to
prog -arg file
The only program the historically allowed 'late' options
was 'rlogin hostname -l username'.
This is just broken.....
David
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UK
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