Re: Q: bash parameter expansion

[Andreas Schwab]

"Dmitry V. Levin" <ldv@altlinux.org> writes:

> I wonder whether such difference in parameter expansion is valid:
>
> $ env -i sh -c 'fun() { echo "[${*#foo }]"; }; fun foo bar'
> [foo bar]
> $ env -i sh -c 'fun() { echo "[${*#foo}]"; }; fun foo bar'
> [ bar]

Works as documented:

`${PARAMETER#WORD}'
`${PARAMETER##WORD}'
     The WORD is expanded to produce a pattern just as in filename
     expansion (*note Filename Expansion::).  If the pattern matches
     the beginning of the expanded value of PARAMETER, then the result
     of the expansion is the expanded value of PARAMETER with the
     shortest matching pattern (the `#' case) or the longest matching
     pattern (the `##' case) deleted.  If PARAMETER is `@' or `*', the
                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^
     pattern removal operation is applied to each positional parameter
                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     in turn, and the expansion is the resultant list.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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