Shell Script 020-DIR.sh

#!/bin/sh
#  DIR - pretend we're the DIR command in DOS and display the contents
#    of the specified file, accepting some of the standard DIR flags

usage()
{
cat << EOF >&2
  Usage: $0 [DOS flags] directory or directories
  Where:
   /D 		sort by columns
   /H		show help for this shell script
   /N	 	show long listing format with filenames on right
   /OD	 	sort by oldest to newest
   /O-D 	sort by newest to oldest
   /P 	 	pause after each screenful of information
   /Q		show owner of the file
   /S		recursive listing
   /W	 	use wide listing format
EOF
  exit 0
}

postcmd=""
flags=""

while [ $# -gt 0 ]
do
  case $1 in
    /D     ) flags="$flags -x"		;;
    /H	   ) usage			;;
    /[NQW] ) flags="$flags -l"		;;
    /OD    ) flags="$flags -rt"		;;
    /O-D   ) flags="$flags -t"		;;
    /P     ) postcmd="more"		;;
    /S     ) flags="$flags -s"		;;
	 * ) # unknown flag: probably a dir specifier
	        break;	# so let's get outta the while loop
  esac
  shift	      # processed flag, let's see if there's another
done

# done processing flags, now the command itself:

if [ ! -z "$postcmd" ] ; then
  ls $flags "$@" | $postcmd
else
  ls $flags "$@"
fi

exit 0