List Grep: Show all occurrences of your search in a path

lg

#!/bin/bash
# Author: Rômulo Farias
# Year: 2017
# Name: List Grep
# Description: show all occurrences of your search in a path
# Usage: lg [optional dir] searchString
# Installation: copy this file to /bin and give it execution permission

if [ $# -eq 0 ]; then
  echo "This script must take at least 1 param"
  exit
fi

if [ $# -eq 1 ]; then
  ls -la | grep $1
  exit
fi

if ! [ -d $1 ]; then
  echo "First param must be a directory"
  exit
fi

ls -la $1 | grep $2