A bash script that generates a random password and copies it to pastebook.

passgen.sh

#!/bin/bash

LENGTH=16
if [ "$#" -gt 0 ]; then
  LENGTH="$1"
fi

# from: https://gist.github.com/earthgecko/3089509
RESULT=`cat /dev/urandom \
  | LC_CTYPE=C tr -dc 'a-zA-Z0-9-.?~!@#$%^&*' \
  | head -c "$LENGTH"`

# comment out this line if you are not using Mac OS X
echo -n "$RESULT" | pbcopy
echo "$RESULT"