On 01/03/2011 11:27 AM, Glasgow, Steven Mr CIV USA TRADOC wrote:
RHEL 5.4:
@ D=44 ; echo $D returns 44
@ D=044 ; echo $D returns 36 --- HUH?
@ D=08 ; echo $D returns @: Badly formed number --- HUH?
Seems to be an octal thing going on. Would anyone be able to shed some
light on this and how I might get 5.4 to act more like 4.7?
To be honest, I wasn't able to reproduce this behavior on my RHEL5.5
system with the bash-3.2-24.el5.x86_64 package:
% D=08; echo $D
08
However, I remember having problems with using 'date "+%H"' and then
using the -gt greater-than comparisons, because date zero-spaced the
hour and 8AM was "08". I ended up fixing it by using %k instead of %H.
Bash now interprets numbers starting with a 0 as octal. This is common
in other languages as well. You could force the encoding by using 10#08
I believe, however I don't believe there is a way to disable this
behavior, since a leading zero is the well-understood way to denote an
octal value on Unix and Linux systems.
--
Jonathan Billings <jsbillin@xxxxxxxxx>
College of Engineering - CAEN - Unix and Linux Support
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