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Re: HISTCMD variable always returns 1 when used in PROMPT_COMMAND, bash


From: Chet Ramey
Subject: Re: HISTCMD variable always returns 1 when used in PROMPT_COMMAND, bash 3.1
Date: Tue, 27 Dec 2005 18:13:54 -0500
User-agent: Thunderbird 1.5 (Macintosh/20051201)

Arjen Meek wrote:
> Hello,
> 
> I'm having a problem in bash 3.1 that I'm pretty sure is a bug. As
> indicated in the subject, the HISTCMD variable always returns 1 when
> used in PROMPT_COMMAND , rather than the actual number of the current
> line in the history. 

It's not a bug.  Bash-3.1 returns the history position as the value
of HISTCMD only when it's actually saving commands on the history list
(which non-interactive execution like PROMPT_COMMAND evaluation has
never done).  Bash-3.0 returned essentially random values when it
wasn't saving commands to the history, as long as HISTSIZE was set.

Chet
-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
( ``Discere est Dolere'' -- chet )
                                                Live Strong.
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/




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