NBash

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#!/bin/bash
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function usage {
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	cat << EOF >&2
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	Usage: $0 [DOS flags] directory or directories
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	Where:
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		/D sort by columns
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		/H show help 
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		/N show long listing format with filenames on right
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		/OD sort by oldest to newest
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		/O-D sort by newest to oldest
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		/P pause after each screenful of information
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		/Q show owner of the file
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		/S recursive listing
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		/W use wide listing format	
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EOF
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	exit 1
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}
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# Основной сценарий
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postcmd=""
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flags=""
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while [ $# -gt 0 ]
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do
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	case $1 in
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		/D 		) flags="$flags -x" ;;
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		/H 		) usage ;;
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		/[NQW] 	) flags="$flags -l" ;;
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		/OD 	) flags="$flags -rt" ;;
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		/O-D 	) flags="$flags -t" ;;
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		/P 		) postcmd="more" ;;
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		/S 		) flags="$flags -s" ;;
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		*		) break ;;
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	esac
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	shift
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done
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if [ ! -z "$postcmd" ] ; then
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	ls $flags "$@" | $postcmd
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else
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	ls $flags "$@"
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fi
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exit 0