Logging - with filtering

log.sh

# Tail Files in Directory
  # USAGE: $ log {arg1:file filter(opt)} {arg2:string filter(opt)}
function log (){
 if [ $# -lt 1 ];
 then
  tail -f *
 fi

 if [ $# -gt 1 ];
 then
  tail -f $1 | grep --line-buffered "$2"
 else
  tail -f $1
 fi
}