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Here's how to get /tmp 85% full; change the value if you like:$ amt=$(df --total /tmp | awk '/^total/ { printf "%d\n", (($2 * 1024) * 0.85); exit}')
$ dd if=/dev/zero of=/tmp/filler bs=${amt} count=1

Seems reasonable to me, but I'd do this:
exec("comand && (sleep 3 ; kill -TERM $!; sleep 1; kill -9 $!)");This mimics the usual shutdown sequence: give the process a change to die gracefully (-TERM)...

You've blocked the shell from expanding $cc with the single quotes:
cat in.file|awk -v cnt=0 -v replace="NEWSTUFF" "/$cc/{if (cnt=="0"){sub(/$cc/,replace)};cnt++} {print}" > out.file
Of course, now...

awk '{ print NF ? $0 : ++n }'