Date: Sat, 18 May 2013 23:41:36 +0000 From: "Teske, Devin" <Devin.Teske@fisglobal.com> To: Polytropon <freebsd@edvax.de> Cc: FreeBSD Questions <freebsd-questions@freebsd.org>, "Teske, Devin" <Devin.Teske@fisglobal.com> Subject: Re: check variable content size in sh script Message-ID: <13CA24D6AB415D428143D44749F57D7201F507DD@ltcfiswmsgmb26> In-Reply-To: <20130518180634.9e5fd3c2.freebsd@edvax.de> References: <5194F65F.6080503@a1poweruser.com> <5194FB0A.9090400@tundraware.com> <13CA24D6AB415D428143D44749F57D7201F4D41F@ltcfiswmsgmb26> <5197998E.6050200@sneakertech.com> <51979A8B.8080703@tundraware.com> <5197A526.7020302@sneakertech.com> <20130518180634.9e5fd3c2.freebsd@edvax.de>
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On May 18, 2013, at 9:06 AM, Polytropon wrote:
> On Sat, 18 May 2013 11:58:30 -0400, Quartz wrote:
>>=20
>>>> newfoo=3D${foo:0:51}
>>>>=20
>>>=20
>>> That works for bash, not sh.
>>=20
>> Ok granted, but I don't think that ${#foo} is straight sh either, so I=20
>> assumed "things bash/tcsh/ksh/whatever accept when running in sh=20
>> emulation" were ok.
>=20
> By default, there is no bash on FreeBSD, and therefor no emulation
> and "implicit features". :-)
>=20
> At least FreeBSD's implementation of sh (which is ash, I think)
dash actually -- the Debian Almquist shell (descendent of NetBSD's ash).
--=20
Devin
> supports the # functionality. From "man sh":
>=20
> ${#parameter}
> String Length. The length in characters of the value of
> parameter.
>=20
> And:
>=20
> ${parameter#word}
> Remove Smallest Prefix Pattern. The word is expanded to prod=
uce
> a pattern. The parameter expansion then results in parameter,
> with the smallest portion of the prefix matched by the pattern
> deleted.
>=20
> Check the chapter "Parameter Expansion" for more surprising
> things that are supported by ye olde /bin/sh. :-)
>=20
>=20
>=20
> --=20
> Polytropon
> Magdeburg, Germany
> Happy FreeBSD user since 4.0
> Andra moi ennepe, Mousa, ...
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