[ILUG] kill signals

[Adrian Flynn]

Hi

What is the correct kill signal to close a process and ALL its child
processes cleanly? I am trying to stop and restart a shell script which
pipes serial port data through several text procesing command. THere are 4
processes in the process table for the script. When I kill -SIGINT, or
kill -SIGTERM the shell processes, the other child processes remain running.
Note it is important that all files are properly closed on termination so I
cannot use SIGKILL.

The command line is of the form:
cat /dev/ttyS0 |tr '\r' '\n' |csplit --digits=10 --prefix=~/`date
"+%Y-%m-%d-%H:%M:%S"`_ --elide-empty-files - /^L/ {*}

This, within a shell script, results in the following processes:
	bash
	cat
	tr
	csplit

If I SIGINT or SIGTERM the bash process, the others remain running

Many thanks in advance
Adrian

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