Shell Programming and Scripting

#! /usr/bin/sh

if [ ! -n "$1" ]
then
  echo "Usage: junk -l | -p | {filename}*"
else
  if [ "$1" -eq "-l" ]  # Test for '-l' input. Will always stop here, even if testing for '-p'
  then
    echo "The -l option was given"
    echo "The contents of the directory will be listed"
  else
    if [ "$1" -eq "-p" ]  # Test for '-p' input
    then
      echo "The -p option was given"
      echo "Directory and all files will be removed"
    else
      echo "do nothing"  # '-p' always fall through to here.
    fi
  fi
fi
exit 0

if [ "$1" = "-l" ]

while getopts lp opt
do
    case $opt in
        l) LIST_MODE=1 ;;
        p) DEL_MODE=1 ;;
        *) echo "Illegal option" ; exit 2 ;;
    esac
done
 
if [ -z "$LIST_MODE$DEL_MODE" ]
then
    echo "do nothing"
    exit 3
fi
if [ "$LIST_MODE" = "1" ]
then
    echo "List mode"
else
    echo "Del mode"
fi