Compute a SHA-1 hash of a directory (sort of)

sha1dir.sh

#!/bin/sh

# arguments check
if [ -z "$1" ]
then
   echo "Usage: sha1dir /path/to/directory"
   exit 1
fi

# run sha1sum on every file
cd $1
find . -type f -print0  | xargs -0 sha1sum | sort | sha1sum