[ILUG] Passing arguments containing spaces
blf at blf.utvinternet.ie
Fri Dec 30 18:04:23 GMT 2005
| Date: Fri, 30 Dec 2005 14:39:25 +0000
| From: Liam O'Hagan <liam at liamohagan.com>
|[ ... ] if I do this :
| command=3D"mp3info -a \"Louis Armstrong\" -l \"The Essential Louis\" -t \
| \"Basin Street Blues\" \"Basin Street Blues.mp3\""
| Then issue :
| [ it obviously won't work ].
as others have pointed out, for what yer doing,
you should consider rewriting it as command='...'
(mostly for clarity) and then, in any case, use eval.
the problem here is since eval effectively re-parses
its arguments, if you have a shell metacharacter such
as $ or ? or * or ` or so on as part of the value of
$command, you may run into additional problems.
there is _another_ way of doing essentially what
yer doing that does not have that glitch:
declare -a command=( mp3info -a "Louis Armstrong" ... )
i.e., use an array. no need for strange quoting,
no need for an eval, and no problems with embedded
$, ?, *, and so on. the above syntax is, AFAIK,
GNU bash(1)-only, albeit there is an equivalent
in the Korn shell (ksh(1)).
( for various other Bourne-ish shells without
arrays, there is a kludge or two which is
equivalent to the above. )
Experienced (20+ yrs) kernel/software Eng: | Brian Foster Montpellier,
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