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perl -Mstrict -e 'sub iso_stamp{
my $epoch=shift;my @time=localtime($epoch);
return sprintf "%04d-%02d-%02d.%02d.%02d",$time[5]+1900,$time[4]+1,@time[3,2,1];
}
my...

I would suggest you to have these timestamps in a file which will not be modified by any other process.

So, for the first run of the script you can print "TimeBefore" to $CURRENT_DATE. The other...

trydos2unix update.sh update.shthen run the scriptupdate.sh 1

Perl is about the only portable option for date math, and as perl oneliners go that's both short and readable.

Let's try this then:-date +%Y-%m-%d-%H.%M.%S
perl -e 'use POSIX qw(strftime);print scalar(strftime "%Y-%m-%d-%H.%M.%S" , localtime(time - 300)), "\n";' The first date is just to show the difference....

With the fairly common -d flag not being available for AIX, I've cobbled together this:-date
perl -e 'print scalar localtime(time - 300), "\n";'THis gives you the calculation, but the output may not...

use this sed -i.bak "2s/=.*/=$(date +"%Y-%m-%d-%H.%M.%S" )/" file
-i[SUFFIX], --in-place[=SUFFIX]
edit files in place (makes backup if extension supplied)

The common way is to redirect the output output to a new file.
some_cmd file > newfile

If the output is correct then you can replace the old file with the new file. If that file is important, you...