Re: Check existence of a program

[Jérémie Roquet <arkanosis@xxxxxxxxx>]

Sorry for the double-reply, I missed the list.

2011/2/1 Anonymous bin Ich <ichbinanon@xxxxxxxxx>:
> 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?
>

You have overridden $path :-)

-- 
Jérémie