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History counts backwards

From: geoff
Subject: History counts backwards
Date: Sat, 25 Dec 2004 00:42:14 +0100 (CET)

Configuration Information [Automatically generated, do not change]:
Machine: i586
OS: linux
Compiler: gcc -I/usr/src/packages/BUILD/bash-3.0 
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i586' 
-DCONF_OSTYPE='linux' -DCONF_MACHTYPE='i586-suse-linux' -DCONF_VENDOR='suse' 
-DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL -DHAVE_CONFIG_H  -I.  
-I. -I./include -I./lib   -O2 -march=i586 -mcpu=i686 -fmessage-length=0 -Wall 
-D_GNU_SOURCE -Wall -pipe -g -fbranch-probabilities
uname output: Linux bow 2.6.8-24.5-default #1 Wed Nov 17 11:10:06 UTC 2004 i686 
i686 i386 GNU/Linux
Machine Type: i586-suse-linux

Bash Version: 3.0
Patch Level: 0
Release Status: release


While submitting my previous bug report (on trap) I was surprised to
get odd history sequence numbers from a subshell:

        bow:487> bash
        bow:2:500> trap 1 2 15
        bow:2:499> kill -15 $$
        bash: 1: command not found
        bow:2:498> ls
        pc140004.jpg  pc140026.jpg  pc160053.jpg  pc160060.jpg  pc160070.jpg
        pc140007.jpg  pc140028.jpg  pc160054.jpg  pc160061.jpg  pc160075.jpg
        pc140008.jpg  pc150034.jpg  pc160057.jpg  pc160063.jpg
        pc140011.jpg  pc150035.jpg  pc160058.jpg  pc160064.jpg
        pc140012.jpg  pc160052.jpg  pc160059.jpg  pc160068.jpg
        bow:2:492> echo a
        bow:2:493> echo b
        bow:2:494> echo c
        bow:2:495> exit

I wasn't doing anything with shells in other windows at the time.  As
you can see, eventually it decided to start counting forwards again.

        No idea, though I think I've seen it happen before.

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