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how 15 is today's date?

20140715 <= today's date

today=$(date +%Y%m%d)
grep -v "${today}" filename

We really don't (yet) have a posting that addresses the general problem of number of days between two dates. So I have just finished what should be the last date calculation script that I ever...

Try this:
rsync -ravz -e ssh */00 remote_host:/tmp

O by the way, the matching syntax use in a case statement is Unix Pattern matching, not ERE .

Might need to flip value2 and value2:[0-9][0-9] around

case $var in
value1) echo value1 ;;
value2:[0-9][0-9]*) echo "part1=${var%%:*} part2=${var#*:}" ;;
value2) ...

Try this:

case "$var" in
value1) echo value1 ;;
value2) echo value2 ;;
*:[0-9][0-9]*) echo part1=${var%:*} part2=${var#*:} ;;
*) echo "Unknown format" >&2 ;;
esac

If you still insist on perl, here's one.
$ cat inputfile
;;search_value#field1#field2#junk#junk#junk#junk
$ perl -F"#" -lane '$e=shift @F;if($e=~ /^\S+'$search_string'/){print "@F"}' inputfile...

Improve your awk script, I'd say... Surely it's possible to make it portable, if it isn't already. The only thing I see which might not be completely portable is the -v. In what way does it not...

Ok, but be aware: perl is NOT POSIX so it is not guaranteed to be on a given unix box.

Next, there are different awk versions on some machines - KSH by itself does not enforce a particular version...