Function for clear log files.

#!/bin/bash
# This function assumes file name
# as a argument and if exists
# truncate it content and show
# success message
# Example of usage:
# clearLogFile "fileName.txt"
function clearLogFile {
 if [ -e $1 ]
 then
   cat /dev/null > $1
   echo "Log file ${1} is cleared."
 else
   echo "File ${1}  don't exists"
 fi
}