Find the 10 largest directories on POSIX

This script outputs the number of 1,024 byte blocks consumed by each of the 10 largest directories in the provided directory, or in the current directory if no arguments are provided.

From: Warren Young

Date: Wed, 30 Jan 2013 21:08:33 -0700

"This script helps me find the 10 biggest pigs on any system with a basic POSIX user environment."

#!/bin/sh

if [ $# -eq 0 ]

then

    dir=.

else

    if [ ! -d $1 ]

    then

        echo usage: $0 [directory] [options]

        echo

        echo "  Prints kb in use in directory; if directory isn't"

        echo "  given, '.' is assumed."

        echo

        echo "  If you give options, they are passed to du, in addition"

        echo "  to the -sk options the script provides."

        echo

        exit

    fi

    dir=$1

fi

echo -n Hang on, finding pigs in

if [ $dir = . ]

then

    echo " current directory..."

else

    echo " \"$dir\"..."

fi

du -skx $2 $dir/* | sort -rn | head -10