Simple script to clean up Minecraft log files from the "Can't keep up" messages.

logcleanup.sh

#!/usr/bin/env bash

# Cleans up Minecraft log files from those pesky "Can't keep up" messages.

if [ $# -gt 1 ] || [ $# = 0 ]
then
	echo 'This script requires one argument. That should be the name of the log file.'
	exit 2
else
	:
fi

if [ -e $1 ]
then
	:
else
	echo 'File doesn`t exist. Derp.'
	exit 2
fi

if lsof $1 >& /dev/null
then
	echo 'Log file is in use. Stop the server that is using the file and try again.'
	exit 1
else
	:
fi

sed '/^[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9] [0-9][0-9]:[0-9][0-9]:[0-9][0-9] \[WARNING\] Can.t keep up\! Did the system time change\, or is the server overloaded?$/d' $1 > cleanedup
rm $1
mv cleanedup $1