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Re: A short form for if-then-else

X-seq: zsh-users 14496
From: Andrey Borzenkov <arvidjaar@xxxxxxxxx>
To: zsh-users@xxxxxxxxxx
Subject: Re: A short form for if-then-else
Date: Thu, 15 Oct 2009 20:43:49 +0400
Cc: Anonymous bin ich <ichbinanon@xxxxxxxxx>
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On Thursday 15 of October 2009 20:36:50 Anonymous bin ich wrote:
> Hi!
> 
> I want to check if a program (mailx) is present or not. If present,
> the program will be run, if not, an error message should be printed.
> No other message should be printed.
> 
> I have tried following ways:
> 
> which mailx &>/dev/null && mailx || echo "not found"
> 
> but when mailx exits with non 0 error code, "not found" is printed.
> 
> I tried
> 
> if [[ -x =mailx ]]; then mailx; else echo "not found"; fi
> 
> but when mailx is not present, zsh prints an error which I cannot
>  seem to redirect to /dev/null
> 

if which mailx > /dev/null; then ...

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References:
- A short form for if-then-else
  - From: Anonymous bin ich

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