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Exercises

Write a C program which traps all the signals (that can be trapped) and displays a suitable message when any signal is received by the process.
Write a program which reads and displays characters typed at the keyboard. Set up an alarmO which will print a message if no characters are typed within a short space of time.

Write a program to send SIGKILL signals to all of your running processes except your current shell (and the current process) based on the following shell script:

	pidlist=`ps -aux | grep "^$LOGNAME" | grep -v $$ | \
	    tr -s " " | cut -f 2 -d " "`
	for pid in pidlist
	do
		kill -9 $pid >/dev/null 2>/dev/null 
	done

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