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Did you try nawk?
Another way -

val=$( pntadm... )
ip=${val% *}
time=${val#* }


--ahamed

I was not talking arrays, but files. Have pntadm output its info on ALL subnets into one file, and then you have your check file / final file. testing one against the other, you can select / reject...

Ok it was my mistake.
-R works only with -p
so you can do something like this

# uname -a
SunOS ldom 5.10 Generic_141414-01 ...
# showrev -p | grep 141414
Patch: 141414-01 Obsoletes: ...

# mkdir /a
# beadm mount ABE /a
# showrev -a -R /a

With bash or ksh93, you can do something like:
grep -vxFf <(grep -Ev "#|^$" file1) file2

Some greps can do this:
grep -Ev "#|^$" file1 | grep -vxFf - file2

otherwise you could use...

Try /usr/xpg4/bin/grep

You would need ksh93 (not ksh88) for these extended pattern lists, and I suspect the spaces should not be there:
if [[ "$inc_num" == ?([+-])+([0-9]) ]] || [[ $inc_num == S ]] || [[ $inc_num == s ]]...

You have not specified the file after the grep statement...
But there is another problem here, your shell does not understand that kind of substitution. You would need to use /usr/dt/bin/dtksh...