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Re: use of "build.sh -B BUILDID".... with patch and more questions

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At Fri, 05 Dec 2025 08:51:20 +0700, Robert Elz <kre@munnari.OZ.AU> wrote:
Subject: Re: use of "build.sh -B BUILDID".... with patch and more questions
>
> I haven't really been following this, I'd never heard of BUILDID
> before, but:
>
>   | +	# remove any leading (and trailing) whitespace
>   | +	val=${val##*[[:blank:]]}
>   | +	val=${val%%*[[:blank:]]}
>
> Those don't do what you want, the first would remove everything up
> to, and including, the rightmost blank in the variable's value.

Oops!  Sigh, I had only tested those with ksh, but not even properly
there it seems.

I think though I've settled on just letting the shell do it while
parsing a command line, i.e.:

	var=$(echo $var)

That gets rid of extraneous duplicate whitespace between words too.

In a function taking a varname argument:

trim ()
{
	local _var _val

	if [ $# -ne 1 -o -z "${1}" ] ; then
		echo "Usage: trim varname" >&2
		return 2
	fi

	_var="$1"
	eval _val=\"\${${_var}}\"

	eval ${_var}=\$\(echo \${_val}\)

	unset _var _val
}

--
					Greg A. Woods <gwoods@acm.org>

Kelowna, BC     +1 250 762-7675           RoboHack <woods@robohack.ca>
Planix, Inc. <woods@planix.com>     Avoncote Farms <woods@avoncote.ca>

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Re: use of "build.sh -B BUILDID"....  with patch and more questions "Greg A. Woods" <woods@planix.ca> - 2025-11-30 17:46 -0800
  Re: use of "build.sh -B BUILDID"....  with patch and more questions "Greg A. Woods" <woods@planix.ca> - 2025-12-03 10:50 -0800
    Re: use of "build.sh -B BUILDID"....  with patch and more questions "Greg A. Woods" <woods@planix.ca> - 2025-12-04 14:45 -0800
      Re: use of "build.sh -B BUILDID".... with patch and more questions Robert Elz <kre@munnari.OZ.AU> - 2025-12-05 08:51 +0700
        Re: use of "build.sh -B BUILDID".... with patch and more questions "Greg A. Woods" <woods@planix.ca> - 2025-12-04 22:37 -0800
          Re: use of "build.sh -B BUILDID".... with patch and more questions "Greg A. Woods" <woods@planix.ca> - 2025-12-04 22:49 -0800
        Re: use of "build.sh -B BUILDID".... with patch and more questions Jarle Greipsland <jarle.greipsland@norid.no> - 2025-12-05 09:33 +0100
          Re: use of "build.sh -B BUILDID".... with patch and more questions RVP <rvp@SDF.ORG> - 2025-12-08 06:51 +0000
            Re: use of "build.sh -B BUILDID".... with patch and more questions "Greg A. Woods" <woods@planix.ca> - 2025-12-08 01:12 -0800
            Re: use of "build.sh -B BUILDID".... with patch and more questions Jarle Greipsland <jarle.greipsland@norid.no> - 2025-12-08 11:59 +0100
              Re: use of "build.sh -B BUILDID".... with patch and more questions "Greg A. Woods" <woods@planix.ca> - 2025-12-08 17:58 -0800
                Re: use of "build.sh -B BUILDID".... with patch and more questions Jarle Greipsland <jarle.greipsland@norid.no> - 2025-12-09 11:14 +0100

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