Package: bash
Version: 4.2+dfsg-1
Severity: normal
Dear Maintainer,
Thank you very much for maintaining Debian's
bash package.
It's important.
People using the nicknames "geirha" and "ormaaj"
in the #bash channel at freenode's IRC network and
I happened to notice bash doing something we
didn't expect.
We found two circumstances where it appeared to
lose a little data.
I duplicated the little loss with versions
4.2.45(1)-release and 4.3.0(1)-rc1.
The later was running as a bot in freenode's
#evalbot channel.
OK, here's the first code that elicits the odd
behavior:
$ echo 'set -x; echo "a" >> /dev/stderr ; echo "b" >> /dev/stderr' > ./c ;
chmod 755 ./c ; ./c > ./d 2>&1 ; cat ./d ; rm ./c ./d
I expected the first echo statement to produce an
output line containing just an "a".
However, all I got was
echo 'set -x; echo "a" >> /dev/stderr ; echo "b" >> /dev/stderr' > ./c ;
chmod 755 ./c ; ./c > ./d 2>&1 ; cat ./d ; rm ./c ./d
++ echo a
++ echo b
b
The second sample code is:
$ set -v; echo 'f() { echo a >>/dev/stderr ; }; f; echo b >&2' >./c; chmod
755 ./c; ./c >./d 2>&1; cat ./d ; rm ./c ./d
Likewise, I expected its first echo statement to produce an
output line containing just an "a".
However, I got only
set -v; echo 'f() { echo a >>/dev/stderr ; }; f; echo b >&2' >./c; chmod
755 ./c; ./c >./d 2>&1; cat ./d
b
The "a" line reappears if "set -x" is not used ...
$ echo 'echo "a" >> /dev/stderr ; echo "b" >> /dev/stderr' > ./c ; chmod
755 ./c ; ./c > ./d 2>&1 ; cat ./d ; rm ./c ./d
a
b
It also reappears if a file is not used ...
$ { set -x; echo "a" >> /dev/stderr ; echo "b" >> /dev/stderr ; } 2>&1
+ echo a
a
+ echo b
b
I hope that helps,
Kingsley
-- System Information:
Debian Release: jessie/sid
APT prefers unstable
APT policy: (990, 'unstable')
Architecture: i386 (i686)
Kernel: Linux 3.0.0-1-686-pae (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages bash depends on:
ii base-files 7.2
ii dash 0.5.7-3
ii debianutils 4.4
ii libc6 2.17-97
ii libtinfo5 5.9+20130608-1
Versions of packages bash recommends:
ii bash-completion 1:2.0-1
Versions of packages bash suggests:
ii bash-doc 4.2+dfsg-1
-- Configuration Files:
/etc/bash.bashrc changed [not included]
-- no debconf information
--
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