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Re: bash: cd improvement


From: Chet Ramey
Subject: Re: bash: cd improvement
Date: Mon, 13 May 2002 13:18:15 -0400

> dont know if this is targeted correctly,
> or in any way interesting.
> 
> Ive written a little patch that will let a user
> change directory to the working directory of a specific job.
> 
> cd %<jobid>

Easy enough to do with a shell function:

jwd()
{
        local j
        jwd=            # global
        j=$(jobs "$1")
        [ -z "$j" ] && return;
        case "$j" in
        *\(wd:*)        jwd=${j##*(wd: } ; jwd=${jwd%?} ;;
        *)              return ;;
        esac
}

This takes a job id as an argument and sets $jwd to that job's working
directory, if it differs from $PWD (and is thus printed in the output
of `jobs').  This function can be compressed; it's in separate steps
so you can follow the logic.  You could also augment it to assign $PWD
to jwd if the job's working directory is the same as $PWD for completeness,
if you like.

You can do something like this, (probably) augmenting an already-existing
function replacement for `cd':

cd()
{
        ...

        case "$1" in
        %*)     jwd $1
                [ -n "$jwd" ] && builtin cd "$jwd"
                return ;;
        *)      builtin cd "$@" ; return ;;
        esac

        ...
}

Chet

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
( ``Discere est Dolere'' -- chet)

Chet Ramey, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/



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