Shell script help needed

[Physically Pffft]

Our application has it's source code in 9 directories, and I find that
often I need to make similar changes in all 9 directories.  Manually
cd'ing into each directory is error prone, some are skipped and others
are entered more than once.  I'd like to write a shell script to automate
this that would act as follows:

1.  Enter all the directory names into a file (only need to do once)
2.  Invoke the script, it reads the first directory from the file and
    cd's into it.  It then suspends itself.
3.  I do what I need to.
4.  I enter 'next' or something to wake up the script, it reads the next
    directory from the file and cd's into it.  Steps 2-4 are done for
    all directories.

My problem is I don't know how to suspend a shell script like this, and then
have it continue where it left off.  My only idea is to create a new shell
('/bin/sh'), but I think this would be slower than snail snot.  Anyone
have any ideas?  Thanks.

							Jim

-- 
Jim Harkins		jlh at loral.cts.com
Loral Instrumentation, San Diego