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Thanks jim mcnamara (https://www.unix.com/members/32659.html).

--forest gives me all data I need, but also much more than I expected. So I would have to create some smart "grep" logic to drop all...

Dear experts,
I'm moving from SunOS to Linux.
Linux has no ptree, but it has pstree. Anyway, pstree doesn't show what ptree used to print with output nice to grep. My Linux distribution doesn't...

Chubler_XL, thanks, return works well but this is not desired action for my case.

Corona688, ygemici - thank you for explanation, now I know why.
I tried to use this knowledge and modify my...

I took a look at ksh93 defect pointed by you... it might be this same, but I'm not sure - I think some research in source of ksh93 would be needed.

Let me paste the script again, now a bit...

@dude2coo, thanks for the quick response.

After adding "0", nothing changed. Script still waits for user input after receiving USR1.
Thanks

Dear shell experts,

I spent last few days porting ksh script from ksh88/SunOS to ksh93/Linux.
Basically, things are going well and I do not have too much troubles porting ks88 script to...

sort -u <file_name>

Did you try to use diff command?
Before 'diff' you may try to sort it first by 3rd word in the file.
--j

you may also try this:
[ works for ksh93 ]
typeset -l a
typeset -l b
read a
cat a.dat | while read first sec junk
do
b=${sec}
[[ ${a} == ${b} ]] && echo "Got ya: $sec, $first"
done

...

If ls -latr won't satisfy you, you may try to pipe output from find, "cut" the word between "_" and ".", and then just "sort" it.

--j