lsr - bash function to list most recently modified files in dir, takes 1 argument - max number of files to list

ls-recent.sh

function lsr(){
  # check if no argument has been supplied
  if [ $# -eq 0 ]
    then
      # if no arg, set file count to 1
      count=1
  else
    # if there is an arg, make sure it's an integer
    re='^[0-9]+$'
    if ! [[ $1 =~ $re ]] ; then
      # if it's not an int, return
       echo "error: argument must be an integer" >&2; return
    fi
    count=$1
  fi
  ls -1t | head -$count
}