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[PATCH] manpage clarification wrt "set -e" and || lists


From: dwitch
Subject: [PATCH] manpage clarification wrt "set -e" and || lists
Date: Tue, 20 Nov 2007 23:41:12 +0100 (CET)

Configuration Information [Automatically generated, do not change]:
Machine: i486
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i486' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i486-pc-linux-gnu' 
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL 
-DHAVE_CONFIG_H   -I.  -I../bash -I../bash/include -I../bash/lib   -g -O2
uname output: Linux gandelf 2.6.19.1-smp #1 SMP Sat Dec 16 13:55:31 CET 2006 
i686 GNU/Linux
Machine Type: i486-pc-linux-gnu

Bash Version: 3.1
Patch Level: 17
Release Status: release

Description:

        As worded, the documentation does not make it clear what the
        behaviour of some scripts is under "set -e".  For reference,
        this was discussed earlier today on #bash on Freenode.

        To be precise, there is an ambiguity in what means "being part
        of" a particular construct.  It is easy to interpret this as
        "directly part of", whereas all shells at hand are consistent
        in this behaviour:


$ bash -ec '(echo 1; false; echo 2); echo 4'
1
4
$ bash -ec '(echo 1; false; echo 2) || echo 3; echo 4'
1
2
4

$ bash -ec 'foo() { echo 1; false; echo 2; };  foo'
1
$ bash -ec 'foo() { echo 1; false; echo 2; };  foo || echo bar'
1
2

Fix:

--- -   2007-11-20 23:27:34.638502222 +0100
+++ bash.1      2007-11-20 23:20:33.000000000 +0100
@@ -7617,7 +7617,8 @@
 .B &&
 or
 .B \(bv\(bv
-list, or if the command's return value is
+list, or run by a subshell which is part of such a list, or run by a
+function called within such a list, or if the command's return value is
 being inverted via
 .BR ! .
 A trap on \fBERR\fP, if set, is executed before the shell exits.




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