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From: Julien Nicoulaud <julien.nicoulaud@gmail.com>
Date: Tue, 1 Feb 2011 20:01:40 +0100
Message-ID: <AANLkTin=vdAq--1hudVrXQQJOqhgr6WvmTT_ccVM_cVP@mail.gmail.com>
Subject: Re: Check existence of a program
To: Anonymous bin Ich <ichbinanon@gmail.com>
Cc: zsh-users@zsh.org
Content-Type: multipart/alternative; boundary=0016e64b03b6d85cab049b3d2a22

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if type exiftime &>/dev/null; then ...

2011/2/1 Anonymous bin Ich <ichbinanon@gmail.com>

> Hello!
>
> I am having trouble checking for existence of a program.
>
> This works:
>
> % cat working.zsh
> #!/bin/zsh
> set -x
> prog="identify"
> path=$(which ${prog})
> %
> % ./working.zsh
> +./working.zsh:3> prog=identify
> +./working.zsh:4> path=+./working.zsh:4> which identify
> +./working.zsh:4> path=/usr/bin/identify
> %
>
> But this doesn't:
>
> % cat notworking.zsh
> #!/bin/zsh
> set -x
> prog="exiftime"
> path=$(which ${prog})
> if [[ ${?} -ne 0 ]]; then
>    prog="identify"
>    path=$(which ${prog})
> fi
> %
> % ./notworking.zsh
> +./notworking.zsh:3> prog=exiftime
> +./notworking.zsh:4> path=+./notworking.zsh:4> which exiftime
> +./notworking.zsh:4> path='exiftime not found'
> +./notworking.zsh:5> [[ 1 -ne 0 ]]
> +./notworking.zsh:6> prog=identify
> +./notworking.zsh:7> path=+./notworking.zsh:7> which identify
> +./notworking.zsh:7> path='identify not found'
> %
>
> Any idea?
>

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