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From: =?UTF-8?B?SsOpcsOpbWllIFJvcXVldA==?= <arkanosis@gmail.com>
Date: Tue, 1 Feb 2011 20:16:32 +0100
Message-ID: <AANLkTimHw40dLOYKWGN2EMcVr=-udt98e_FdDm2CnB8X@mail.gmail.com>
Subject: Re: Check existence of a program
To: zsh-users@zsh.org
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Sorry for the double-reply, I missed the list.

2011/2/1 Anonymous bin Ich <ichbinanon@gmail.com>:
> I am having trouble checking for existence of a program.
>
> This works:
>
> % cat working.zsh
> #!/bin/zsh
> set -x
> prog=3D"identify"
> path=3D$(which ${prog})
> %
> % ./working.zsh
> +./working.zsh:3> prog=3Didentify
> +./working.zsh:4> path=3D+./working.zsh:4> which identify
> +./working.zsh:4> path=3D/usr/bin/identify
> %
>
> But this doesn't:
>
> % cat notworking.zsh
> #!/bin/zsh
> set -x
> prog=3D"exiftime"
> path=3D$(which ${prog})
> if [[ ${?} -ne 0 ]]; then
> =C2=A0 =C2=A0prog=3D"identify"
> =C2=A0 =C2=A0path=3D$(which ${prog})
> fi
> %
> % ./notworking.zsh
> +./notworking.zsh:3> prog=3Dexiftime
> +./notworking.zsh:4> path=3D+./notworking.zsh:4> which exiftime
> +./notworking.zsh:4> path=3D'exiftime not found'
> +./notworking.zsh:5> [[ 1 -ne 0 ]]
> +./notworking.zsh:6> prog=3Didentify
> +./notworking.zsh:7> path=3D+./notworking.zsh:7> which identify
> +./notworking.zsh:7> path=3D'identify not found'
> %
>
> Any idea?
>

You have overridden $path :-)

--=20
J=C3=A9r=C3=A9mie