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vgersh99, that works! Thanks!

Ran new "myscript.sh" still shows "-ksh" not "myscript.sh"

$ . myscript.sh
The code in is being run by -ksh with PID 1581

To get the script name the variable $0 can normally be used.
Problem happens when the command is started with a "dot space" as in: . myscript.sh.
$0 shows -ksh not myscript.sh
From within the...

AIX 5.3 (how do you distinguish further? Not seeing anything more in uname -a )

Using ksh.
Looks like the problem is the platform.
Tested using
cat /tmp/t.txt |sed "s/old/new/g">/tmp/t.txt; cat /tmp/t.txt
File is empty on AIX (IBM) and SunOS.
It worked on HPUX.
Please...

The following leaves an empty file.
cat $1 | sed s/'$old'/'$new'/g > $1
Need to direct to a tmp file and then move it back (is there a better way?)
cat $1 | sed s/'$old'/'$new'/g > $1.$$tmp
mv...