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Re: set -x output of test operator is irretating
From: |
Chet Ramey |
Subject: |
Re: set -x output of test operator is irretating |
Date: |
Thu, 31 Jul 2008 01:20:07 -0400 |
User-agent: |
Thunderbird 2.0.0.16 (Macintosh/20080707) |
Toralf Förster wrote:
Bash Version: 3.2
Patch Level: 33
Release Status: release
Description:
I'm wondering why in the example (see below) the right side is prefixed
with a '\' wheras the left side is unchanged.
Repeat-By:
tfoerste@n22 ~ $ echo "1 2 3 4" | while read a b c d; do [[ "$a" = "$b" || "$a" = "$c" ||
"$a" = "$d" ]] && echo oops; done
+ read a b c d
+ echo '1 2 3 4'
+ [[ 1 = \2 ]]
+ [[ 1 = \3 ]]
+ [[ 1 = \4 ]]
+ read a b c d
++ echo -ne '\033]0;tfoerste@n22:~\007'
Because the ==/!=/= operators are defined to match the rhs as a pattern
unless it's quoted. You quoted the original string, and the `set -x'
output is supposed to be re-usable as input, so the trace output is
quoted appropriately.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
Chet Ramey, ITS, CWRU chet@case.edu http://cnswww.cns.cwru.edu/~chet/