Date: Wed, 10 Feb 2016 13:20:09 +0000 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: freebsd-questions@freebsd.org Subject: Re: /bin/sh starts with check in script Message-ID: <56BB3909.3070505@infracaninophile.co.uk> In-Reply-To: <56BB33E8.4080900@gmail.com> References: <56BB33E8.4080900@gmail.com>
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On 2016/02/10 12:58, Sergei G wrote:
> I came up with this solution to check if variable $line starts with a
> hash. Basically I am checking if line is a comment in the configuratio=
n
> file.
>=20
> #!/bin/sh
> if expr "${line}" : '#.*' > /dev/null; then
> echo Ignoring comment line
> fi
>=20
> I had to redirect to /dev/null, because expr prints a number to STDOUT.=
=20
> Is there a better way to do this kind of string matching check in
> /bin/sh (not bash)?
When you say 'in /bin/sh' I take it you mean without calling any
external programs? Otherwise the natural way would be to use grep(1).
Try:
#!/bin/sh
case ${line} in
"#*")
echo Ignoring comment line
;;
*)
... do whatever ...
;;
esac
Cheers,
Matthew
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