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${1:+"$@"} results differnt from "$@" if IFS is NOT default
From: |
SATOH Fumiyasu |
Subject: |
${1:+"$@"} results differnt from "$@" if IFS is NOT default |
Date: |
23 Jan 2004 05:45:35 -0000 |
Configuration Information [Automatically generated, do not change]:
Machine: i386
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='i386'
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i386-pc-linux-gnu'
-DCONF_VENDOR='pc' -DSHELL -DHAVE_CONFIG_H -I. -I../bash -I../bash/include
-I../bash/lib -g -O2
uname output: Linux sugar 2.4.24-xfs-fumiya-1 #1 Mon Jan 19 21:55:52 JST 2004
i686 GNU/Linux
Machine Type: i386-pc-linux-gnu
Bash Version: 2.05b
Patch Level: 0
Release Status: release
Description:
If IFS has NO default value, ${1:+"$@"} results "$1 $2 $3 ...",
but "$@" results "$1" "$2" "$3" ... .
Repeat-By:
Test script (t.sh):
----------------------------------------
echo_argc()
{
echo $#
}
a()
{
shift
echo_argc "$@"
echo_argc ${1:+"$@"}
echo_argc "${1:+$@}"
echo_argc 1 2 3
}
b()
{
_IFS="$_IFS"
IFS="$1"; shift
echo_argc "$@"
echo_argc ${1:+"$@"}
echo_argc "${1:+$@}"
echo_argc 1 2 3
IFS="$_IFS"
}
a "X" foo bar hoge
echo
b "X" foo bar hoge
----------------------------------------
$ /bin/bash t.sh
3
3
3
3
3
1
1
3
$ /bin/dash t.sh
(or `/bin/ksh t.sh`)
(or `/bin/zsh t.sh`)
3
3
3
3
3
3
3
3
But on Solaris 8:
$ /bin/sh t.sh
3
3
3
3
1
1
1
3
- ${1:+"$@"} results differnt from "$@" if IFS is NOT default,
SATOH Fumiyasu <=