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Date: Mon, 8 May 2017 22:29:17 +0000
From: Daniel Shahaf <d.s@daniel.shahaf.name>
To: shirish =?utf-8?B?4KS24KS/4KSw4KWA4KS3?= <shirishag75@gmail.com>
Cc: zsh-users <zsh-users@zsh.org>
Subject: Re: ./pkg-search.sh: 2: ./pkg-search.sh: Bad substitution in a shell
 script -
Message-ID: <20170508222917.GA2806@fujitsu.shahaf.local2>
References: <CADdDZRmRA=M2kLc7zFEU5peUiVQUorRN=EQeLwDTbtOpS9Ox+A@mail.gmail.com>
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shirish शिरीष wrote on Tue, May 09, 2017 at 02:28:15 +0530:
> ─[$] cat pkg-search.sh
>      1	for file in /usr/share/doc/*/changelog.Debian.gz; do
>      2	    package=${file:15}

> Trying to run the script under zsh I get the following -
> 
> [$] ./pkg-search.sh
> ./pkg-search.sh: 2: ./pkg-search.sh: Bad substitution

That runs the script under sh.  To run it under zsh, add

    #!/usr/bin/env zsh

as the first line of the script.