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read builtin does not return success code (0) in spite of it successfull


From: Коренберг Марк
Subject: read builtin does not return success code (0) in spite of it successfully read line
Date: Fri, 24 Dec 2010 13:20:55 +0500
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.13) Gecko/20101208 Thunderbird/3.1.7

  Configuration Information [Automatically generated, do not change]:
Machine: i686
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='i686' -DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i686-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 -Wall uname output: Linux mmarkk-work 2.6.35-24-generic-pae #42-Ubuntu SMP Thu Dec 2 03:21:31 UTC 2010 i686 GNU/Linux
Machine Type: i686-pc-linux-gnu

Bash Version: 4.1
Patch Level: 5
Release Status: release

GOOD CASE:
address@hidden:/tmp$ echo aaa > /tmp/test1
address@hidden:/tmp$ read x < /tmp/test1 && echo success
success
address@hidden:/tmp$ echo $x
aaa
address@hidden:/tmp$

BUGGY CASE:
address@hidden:/tmp$ echo -n bbb > /tmp/test2
address@hidden:/tmp$ read y < /tmp/test2 && echo success
address@hidden:/tmp$ echo $y
bbb
address@hidden:/tmp$

So, if EOF detected but something is read successfully, please do not report error !


The "dialog" command when writes to --output-fd does not append newline.
so
read result < resultfile || return 1
will fail, but should not (by correct logick).







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