20-DIR

#!/bin/bash
# DIR--Pretends we're the DIR command in DOS and displays the contents
#   of the specified file, accepting some of the standard DIR flags.

function 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 1
}

#####################
### MAIN BLOCK

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 out of 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