trap -- to handle the signal

TEMP_FILE=/tmp/printfile.txt
trap "rm $TEMP_FILE; echo 'exising and removed the $TEMP_FILE';exit 0" \
SIGHUP SIGINT SIGTERM
pr $1 > $TEMP_FILE

echo -n "print file? [y/n]: "
read
if [ "$REPLY" = "y" ]; then
echo "print file"
fi
rm $TEMP_FILE
				
					
						Signal 9 From Outer Space
					
					
						There is one signal that you cannot trap: SIGKILL or signal 9. The kernel immediately terminates any process sent this signal and no signal handling is performed. Since it will always terminate a program that is stuck, hung, or otherwise screwed up, it is tempting to think that it's the easy way out when you have to get something to stop and go away. Often you will see references to the following command which sends the SIGKILL signal:
					
kill -9
					
						However, despite its apparent ease, you must remember that when you send this signal, no processing is done by the application. Often this is OK, but with many programs it's not. In particular, many complex programs (and some not-so-complex) create lock files to prevent multiple copies of the program from running at the same time. When a program that uses a lock file is sent a SIGKILL, it doesn't get the chance to remove the lock file when it terminates. The presence of the lock file will prevent the program from restarting until the lock file is manually removed.
					
					
						Be warned. Use SIGKILL as a last resort.
					
				
				
					A clean_up Function
				
				
					While the trap command has solved the problem, we can see that it has some limitations. Most importantly, it will only accept a single string containing the command to be performed when the signal is received. You could get clever and use ";" and put multiple commands in the string to get more complex behavior, but frankly, it's ugly. A better way would be to create a function that is called when you want to perform any actions at the end of your script. In my scripts, I call this function clean_up.
				
				
#!/bin/bash

# Program to print a text file with headers and footers

TEMP_FILE=/tmp/printfile.txt

clean_up() {

	# Perform program exit housekeeping
	rm $TEMP_FILE exit } trap clean_up SIGHUP SIGINT SIGTERM

pr $1 > $TEMP_FILE echo -n "Print file? [y/n]: " read if [ "$REPLY" = "y" ]; then lpr $TEMP_FILE fi clean_up