Generates a random string of a specified length.

pw.sh

#!/bin/sh

set -e

if [ "$#" -lt 0 ]; then
  echo "Usage: pw 16 [lim]"
  exit 1
fi

if [ "$#" -gt 2 ]; then
  echo "Usage: pw 16 [lim]"
  exit 1
fi

if [ $1 -gt 65535 ]; then
	echo "Requested string is too large"
	exit 1
fi

if [ "$#" -gt 1 ] && [ "$2" != "lim" ]; then
  echo "Unrecognized second parameter"
  exit 1
fi

if [ "$#" -gt 1 ] && [ "$2" = "lim" ]; then
  cat /dev/random | env LC_CTYPE=C tr -cd 'a-z0-9' | head -c $1
else
  cat /dev/random | env LC_CTYPE=C tr -cd 'a-zA-Z0-9`~!@#$%^&*()_+-={}[]|;<,>.?/' | head -c $1
fi

echo