Date: Tue, 9 Dec 1997 18:01:52 -0800 (PST) From: tom@sdf.com To: FreeBSD-gnats-submit@FreeBSD.ORG Subject: bin/5263: sh bug (with example) Message-ID: <199712100201.SAA14215@shell.uniserve.com> Resent-Message-ID: <199712100210.SAA01336@hub.freebsd.org>
index | next in thread | raw e-mail
>Number: 5263
>Category: bin
>Synopsis: sh bug (with example)
>Confidential: no
>Severity: non-critical
>Priority: high
>Responsible: freebsd-bugs
>State: open
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Dec 9 18:10:01 PST 1997
>Last-Modified:
>Originator: Tom
>Organization:
SDF Systems
>Release: FreeBSD 2.2.5-STABLE i386
>Environment:
FreeBSD 2.2.5-STABLE i386
>Description:
sh has a problem with joining lists within a "for x in list1:list2" construct.
Basically, the last element of list1 gets attached to the remaining elements of
list2, and this thing gets returned as single item.
>How-To-Repeat:
Sample script:
#! /bin/sh
PATH=/bin:/usr/bin:/sbin
# The whitespace below is a space followed by a tab
IFS="${IFS= }"; ac_save_ifs="$IFS"; IFS="${IFS}:"
for ac_dir in $PATH:/usr/local/bin$ac_dummy; do
echo "ac_dir is $ac_dir"
done
When run under /bin/sh this script produces:
ac_dir is /bin
ac_dir is /usr/bin
ac_dir is /sbin:/usr/local/bin
When run under bash this script produces:
ac_dir is /bin
ac_dir is /usr/bin
ac_dir is /sbin
ac_dir is /usr/local/bin
This is a big problem for ports, as auto-conf configure scripts often use for
loops like this to scan for certain binaries.
>Fix:
>Audit-Trail:
>Unformatted:
help
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199712100201.SAA14215>