Re: [PATCH] Replace 'test "${var+set}" = set' with 'test -n "${var+set}"

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Re: [PATCH] Replace 'test "${var+set}" = set' with 'test -n "${var+set}"

From:	Paul Eggert
Subject:	Re: [PATCH] Replace 'test "${var+set}" = set' with 'test -n "${var+set}"'
Date:	Wed, 08 Apr 2015 23:49:54 -0700
User-agent:	Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0

Eric Blake wrote:

test ${var+y}


Hah!  Here's something that's one byte shorter:

${var+:} [ ]

It may be clearer to write it more in the style you used:

[ ${var+y} ]

Both of these work with Solaris 10 /bin/sh.

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[PATCH] Replace 'test "${var+set}" = set' with 'test -n "${var+set}"', Bernhard Reutner-Fischer, 2015/04/08
- Re: [PATCH] Replace 'test "${var+set}" = set' with 'test -n "${var+set}"', Paul Eggert, 2015/04/08
  - Re: [PATCH] Replace 'test "${var+set}" = set' with 'test -n "${var+set}"', Eric Blake, 2015/04/08
    - Re: [PATCH] Replace 'test "${var+set}" = set' with 'test -n "${var+set}"', Eric Blake, 2015/04/08
    - Re: [PATCH] Replace 'test "${var+set}" = set' with 'test -n "${var+set}"', Paul Eggert <=
    - Re: [PATCH] Replace 'test "${var+set}" = set' with 'test -n "${var+set}"', Eric Blake, 2015/04/09
    - [PATCH 2/4] AC_PROG_LEX: Rephrase LEX is set test, Bernhard Reutner-Fischer, 2015/04/09
    - Re: [PATCH 2/4] AC_PROG_LEX: Rephrase LEX is set test, Eric Blake, 2015/04/09
    - Re: [PATCH 2/4] AC_PROG_LEX: Rephrase LEX is set test, Bernhard Reutner-Fischer, 2015/04/09
    - [PATCH 0/4] misc test(1) invocation tweaks, Bernhard Reutner-Fischer, 2015/04/09
    - Re: [PATCH 0/4] misc test(1) invocation tweaks, Eric Blake, 2015/04/09
    - [PATCH 4/4] _AC_OUTPUT_FILES_PREPARE: Rephrase CONFIG_FILES test, Bernhard Reutner-Fischer, 2015/04/09
    - Re: [PATCH 4/4] _AC_OUTPUT_FILES_PREPARE: Rephrase CONFIG_FILES test, Eric Blake, 2015/04/09
    - Re: [PATCH 4/4] _AC_OUTPUT_FILES_PREPARE: Rephrase CONFIG_FILES test, Bernhard Reutner-Fischer, 2015/04/09
    - [PATCH 3/4] AC_PROG_MKDIR_P: Also accept BusyBox mkdir -p, Bernhard Reutner-Fischer, 2015/04/09

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