UUCP files/directories being removed under SCO UNIX

Wm E. Davidsen Jr davidsen at sixhub.UUCP
Sun Jun 10 13:32:24 AEST 1990

In article <1990Jun7.155204.27108 at chinet.chi.il.us> les at chinet.chi.il.us (Leslie Mikesell) writes:
| In article <1095 at sixhub.UUCP> davidsen at sixhub.UUCP (bill davidsen) writes:

    [ ... ]

| >  Any competent programmer would write 
| >        cd $i || continue
| >to insure that if the cd failed everything would fail cleanly.
| Perhaps any competent programmer that knew about ksh and its
| incompatibility with /bin/sh.  I suspect that at the time that
| script was writtten, competent programmers knew that /bin/sh would
| exit if a cd fails (a wise default, in my judgement).

  You have a good point there. However, stopping is the last thing you
want to do, since that would fail to do some of the cleanup. Perhaps a
better solution (I've had time to think and your input) would be:

    [ -d $i ] && cd $i || continue

  since that works on sh and ksh, and does not stop if there is a file
instead of directory present.

| I'd put the blame on the authors of ksh for the incompatibilites, or
| whoever decided to use ksh to run scripts written for /bin/sh.

  I can't argue with that, I think the ksh default is really dangerous,
since something like

    cd foo; rm *

  Can kill you in ksh!

| Another annoying incompatibility is that "su -c user script" will
| execute user's .profile if user's login shell is ksh, but not with sh. 

  ?? It will execute the profile names in the ENV variable, but I don't
think it does .profile (unless ENV points there, of course).

| This can cause surprising behaviour when the command is run by cron,
| the .profile has interactive commands, and the user changes his shell.

  I'll look at this next week, but I think it's as I mentioned. I tried
it VERY quickly, but I don't claim that I have the definitive answer.
bill davidsen - davidsen at sixhub.uucp (uunet!crdgw1!sixhub!davidsen)
    sysop *IX BBS and Public Access UNIX
    moderator of comp.binaries.ibm.pc and 80386 mailing list
"Stupidity, like virtue, is its own reward" -me

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