Date: Thu, 11 Feb 2016 15:29:22 +0100 From: Jan Henrik Sylvester <me@janh.de> To: Sergei G <sergeig.public@gmail.com> Cc: questions-list freebsd <freebsd-questions@freebsd.org> Subject: Re: /bin/sh starts with check in script Message-ID: <56BC9AC2.3070805@janh.de> In-Reply-To: <56BB33E8.4080900@gmail.com> References: <56BB33E8.4080900@gmail.com>
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On 02/10/2016 13:58, Sergei G wrote:
> I came up with this solution to check if variable $line starts with a
> hash. Basically I am checking if line is a comment in the configuration
> file.
>
> #!/bin/sh
> if expr "${line}" : '#.*' > /dev/null; then
> echo Ignoring comment line
> fi
>
> I had to redirect to /dev/null, because expr prints a number to STDOUT.
> Is there a better way to do this kind of string matching check in
> /bin/sh (not bash)?
[ "${line#\#}" != "$line" ] && echo comment
See the Parameter Expansion section of sh(1).
Cheers,
Jan Henrik
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