SUMMARY: pushd/popd ksh functions for the unix pc.

[Augustine Cano]

First of all, many thanks to all those who responded to my original posting,
either in a followup or by e-mail; especially to those that sent or posted
code.

I now have 6 versions of pushd/popd and some auxiliary functions, including
the one I typed in that doesn't work.  Surprisingly the only differences
between my non-working version and another from the same source are minor
typographical differences (to fit the page layout of the book? NOT typos,
I checked more than once, very carefully) and function "to_tilde" which
is inline in the working version.

Before I received any code, I saw Thad's posting about the newer KSH from
the STORE, so the first thing I did was to upgrade.  Per the instructions,
which said to add "> $HISTFILE" to truncate the history file on login,
I added /etc/localprofile  (instead of adding that line to /etc/profile.)
This should not make any difference since /etc/localprofile is run from
/etc/profile, as shown below:

...
if [ -x /etc/localprofile ]
then
	. /etc/localprofile
fi
...

These are /etc/profile and /etc/localprofile:

-rw-r--r--  1 root    sys        3817 Nov 25 14:28 /etc/profile 
-rwxr-xr-x  1 root    sys          51 Dec 30 20:21 /etc/localprofile*

And this is /etc/localprofile:

# /etc/localprofile
# created by afc at shibaya.lonestar.org

> $HISTFILE

The problem is that the history file is not truncated at login time.  The
actual history file has these permissions: (just like ksh created it)

-rw-------  1 afc     users        52 Jan  7 22:17 /u/afc/.ksh.hist 

BTW, just typing ". /etc/localprofile" at the prompt has the
expected result.  What am I missing?

Back to pushd/popd:  Since I upgraded to the newer ksh before I tried any
of the code sent, I can't confirm that any of it works on the old version.
However, at least one sender said that his/her version works with V1.2.

As expected, most versions do the same thing.  Everything  I was sent works.
Here's a quick rundown: (in no particular order)

version #1: From: darren at bacchus.BACCHUS.ORG (Darren Friedlein)

The most compact of the bunch.  A grand total of 16 lines!  Including dirs,
pushd and popd.

I'm tempted to just include them below, but then this is not supposed to be
a source distribution.  If there is interest, I can forward everything I
received to Lenny for archiving at OSU.  How about starting a collection of
neat ksh functions?

version #2:  From: jwalz at rsg1.er.usgs.gov (Janet Walz)

According to her: "I grabbed these off the net a long time ago, and made
a couple minor tweaks (probably the sed lines that have similar-looking
things commented out)."

The original author of these is Ray Lubinsky, rwl at uvacs.cs.virginia.edu

This package contains pushd, popd, chdir (cd is aliased to chdir), dirs
and roll (this one is unique to this package, it does the obvious: roll
the stack).

version #3: From: quest!ssb at cs.umn.edu (Scott Sheldon Bertilson)

This package was written by Fletcher Mattox, sally!fletcher and claims to
emulate the csh dirs/pushd/popd exactly.  Some internal details are
different.

version #4: From: "Kris A. Kugel" <uunet!tsdiag.ocpt.ccur.com!hico2!kak>

This one came indirectly from none other than...  David Korn!  Very similar
to the one in the book, before the typesetters got to it, I suppose.

version #5: From: bruce at balilly.UUCP (Bruce Lilly)

If I recall correctly, this set was posted.  This is what Bruce said:

# In addition to Thad's comments, I can offer the following which ``sort
# of'' work (seems to be a minor problem after su'ing).  These are the
# ``dirs'', ``cd'', and ``mcd'' functions described in the same section as
# ``pushd'' and ``popd''.  The push and pop stuff is in-line.  I hope this
# helps.  I've also included a function ``su'' which allows one to run a
# shell as another user in a new window (using windy) -- with this, I only
# run a single login window, as I can then run a new window (e.g. as root)
# to do other things.


Well, here you have it, folks!  Any interest in having a sub-archive of
ksh functions?

Unrelated query:  is some major unix-pc hub down lately?  I haven't received
any unix-pc news in a couple of days.  Other groups are just fine.


-- 
Augustine Cano		INTERNET: afc at shibaya.lonestar.org
			UUCP:     ...!{ernest,egsner}!shibaya!afc