Date: Wed, 9 Apr 1997 22:03:33 -0700 (PDT)
From: filo@yahoo.com
To: freebsd-gnats-submit@freebsd.org
Subject: bin/3245: variable substitution "a=${a:=}" in /bin/sh causes infinite loop
Message-ID: <199704100503.WAA15325@freefall.freebsd.org>
Resent-Message-ID: <199704100510.WAA15679@freefall.freebsd.org>
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>Number: 3245
>Category: bin
>Synopsis: variable substitution "a=${a:=}" in /bin/sh causes infinite loop
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Apr 9 22:10:01 PDT 1997
>Last-Modified:
>Originator: david filo
>Organization:
yahoo
>Release: 2.2-stable (as of 4/9/97)
>Environment:
FreeBSD 67.yahoo.com 2.2-STABLE FreeBSD 2.2-STABLE #0: Thu Apr 10 01:06:58 GMT 1997
>Description:
the following variable substitution in /bin/sh results in an
infinite loop, provided a has a null value. by definition it should
set a to null.
a=${a:=}
>How-To-Repeat:
run the following script
#!/bin/sh
a=
a=${a:=}
>Fix:
>Audit-Trail:
>Unformatted:
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