files_info.sh

#!/bin/bash

# ./files_info.sh [-l location] [--location location] [-e extension] [--extension extension] [-h] [--help] [-s] [--stats]

function usage() {
  echo "USAGE: $0 [-l location] [--location location] [-e extension] [--extension extension] [-h] [--help] [-s] [--stats]"
  echo "Examples:"
  echo "$0 -l /etc/ -e txt -s"
  echo "$0 -e img --stats"
  echo
  exit 1
}

LOC_SET=0 #0-location not set, use current location     1-location set
STATS=0   #0-do not display statistics		              1-display statistics

while [ $# -gt 0 ]; do
  case $1 in
  -l | --location)
    LOCATION="$2"
    if ! [ -d "$LOCATION" ]; then
      usage
    fi
    LOC_SET=1
    shift
    shift
    ;;

  -e | --extension)
    EXT="$2"
    shift
    shift
    ;;

  -s | --stats)
    STATS=1
    shift
    ;;

  -h | --help)
    shift
    usage
    ;;

  *)
    usage
    ;;
  esac

done

if [ $LOC_SET -ne 1 ]; then
  LOCATION=$(pwd)
fi

echo "Location: $LOCATION"

if [ "$EXT" != "" ]; then
  ls -l $LOCATION | awk '/^-/' | grep "\.$EXT$" &>/dev/null
  if [ $? -ne 0 ]; then
    echo "No file with extension: $EXT found"
    exit 2
  fi

  #count size of files with specific extension
  ls -l $LOCATION | awk '/^-/' | grep "\.$EXT$" | awk -v stats=$STATS -f size.awk

else
  ls -l $LOCATION | awk '/^-/' | awk -v stats=$STATS -f size.awk

fi