misc-bash

cleanup.sh

#!/bin/bash

LOG_DIR=/var/log
ROOT_UID=0
LINES=50
E_XCD=86
E_NOTROOT=87
MESSAGES=messages
TMP=mesg.tmp

if [ "$UID" -ne "$ROOT_UID" ]; then
	echo "Must be root."
	exit $E_NOTROOT
fi

if [ -n "$!" ]; then
	lines=$1
else
	lines=$LINES
fi

cd $LOG_DIR

if [ `pwd` != "$LOG_DIR" ]; then
	echo "Can't change to $LOG_DIR."
	exit $E_XCD
fi

tail -n $lines $MESSAGES > TMP 
mv $TMP $MESSAGES 

cat /dev/null > wtmp 
echo "Log files cleaned up."

exit 0