#!/bin/sh

if [  "$1" = "--help" ] || [ "$1" = "-h" ]; then
	cat <<EOF
Usage: ${0##*/} [FILES]

Shuffle letters randomly and print result to stdout. If no file is provided,
stdin is used.

EOF
	exit
fi

fold -w 1 "$@" | shuf | tr -d '\n' && echo

## Interesting AWK alternative, much slower however.
# awk -F'\n' 'BEGIN {srand()} {input=input $0} END {count = split(input,a,"");  while(count >= 1) {i = (int(rand()*count) % count)+1; printf("%s", a[i]); a[i]=a[count];delete a[count]; count--} print ""}' "$@"