#!/bin/ksh
IAm=${0##*/}
usage() {
printf '
SYNOPSIS:
    %s [-d] directory...
    %s -h

DESCRIPTIN:
    For each directory operand given, estimate the amount of disk space
    used by the file hierarchy rooted in that directory, and count the
    number of regular files and directories in that hierarchy.

OPTIONS:
    -a, --subdir	Also list subdirectories of directory operands.
    -h, --help		Display this help notice.

OPERANDS:
    directory	The pathname of a direcotry to be processed.

EXIT STATUS:
    0	Successful completion.
    1	Unexpected options found.
    2	No operands found.
    3	One or more directory operands were not found.

' "$IAm" "$IAm"
}

# Parse options...
dswitch=0
err=0
while getopts -a "$IAm" "d(subdir)h(help)" opt
do	case $opt in
	(d)	dswitch=1;;
	(h)	usage
		exit 0;;
	(?)	err=1;;
	esac
done
# Shift away arguments used for options
shift $((OPTIND - 1))

# If no bad options were found, verify that we have at least one operand...
if [ $err -eq 0 ] && [ $# -lt 1 ]
then	printf '%s: No operands provided\n' "$IAm" >&2
	err=2
fi

# If we had bad optoins or do not have any operands, print help message as a
# diagnostic and exit.
if [ $err -gt 0 ]
then	usage >&2
	exit $err
fi

# Print operands remaining after option parsing...
printf '%s: %d operands remain after option parsing:\n' "$IAm" $#
printf '\t"%s"\n' "$@"
echo

# Process directory operands...
for dirname in "$@"
do	# Be sure directory named by an operand is present...
	if [ -d "$dirname" ]
	then	# The directory is present...
		printf '"CHECKING DIRECTORY: "%s"...\n' "$dirname"
		printf 'SIZE: '
		du -s "$dirname"
		printf 'REGULAR FILES: '
		find "$dirname" -type f | wc -l
		printf 'DIRECTORIES: '
		find "$dirname" -type d | wc -l

		# If -d (or --subdir) option was given, list subdirectories...
		if [ $dswitch -eq 1 ]
		then	find "$dirname" -type d
		fi
		echo
	else	# The directory is not present...
		printf 'Directory "%s" does not exist!\n\n' "$dirname" >&2

		# Set non-zero exit code for when we have finished processing
		# any remaining directory operands.
		err=2
	fi
done
exit $err

sumcontent.sh --help
      or
sumcontent.sh -h

SYNOPSIS:
    sumcontent.sh [-d] directory...
    sumcontent.sh -h

DESCRIPTIN:
    For each directory operand given, estimate the amount of disk space
    used by the file hierarchy rooted in that directory, and count the
    number of regular files and directories in that hierarchy.

OPTIONS:
    -a, --subdir	Also list subdirectories of directory operands.
    -h, --help		Display this help notice.

OPERANDS:
    directory	The pathname of a direcotry to be processed.

EXIT STATUS:
    0	Successful completion.
    1	Unexpected options found.
    2	No operands found.
    3	One or more directory operands were not found.

sumcontent.sh -d $HOME/dl .
      or
sumcontent.sh --subdir $HOME/dl .
      or
sumcontent.sh -d -- $HOME/dl .

sumcontent.sh: 2 operands remain after option parsing:
	"/Users/dwc/dl"
	"."

"CHECKING DIRECTORY: "/Users/dwc/dl"...
SIZE: 158192	/Users/dwc/dl
REGULAR FILES:      239
DIRECTORIES:        3
/Users/dwc/dl
/Users/dwc/dl/pdf
/Users/dwc/dl/spreadsheets

"CHECKING DIRECTORY: "."...
SIZE: 16	.
REGULAR FILES:        3
DIRECTORIES:        1
.

sumcontent.sh -subdir --hat $HOME/dl

sumcontent.sh: -s: unknown option
sumcontent.sh: -u: unknown option
sumcontent.sh: -b: unknown option
sumcontent.sh: -i: unknown option
sumcontent.sh: -r: unknown option
sumcontent.sh: --hat: unknown option