UNIX random password generator

randpw.sh

#!/bin/bash

# Creator [email protected]
#
# Create's random password 
# Should work on Most UNIX systems
# Default with special characters with a length of 12
# Optional -a (alphanumeric)
# Optional -l <number> (length)

usage() { echo "Usage: $0 [-a] [-l <length>]" 1>&2; exit 1; }

CHARS='A-Za-z0-9_%#*@5k^&!$'
LENGTH=12
while getopts "ahl:" o; do
  case "${o}" in
    a)
      CHARS='A-Za-z0-9_'
      ;;
    l)
      LENGTH=${OPTARG}
      ;;
    h)
      usage
      ;;
    *)
      exit 1
      ;;
  esac
done

shift $((OPTIND-1))

export LC_CTYPE=C
tr -dc "${CHARS}" < /dev/urandom | head -c ${LENGTH} | xargs

To install just download, move to /usr/local/bin and make it executable.

curl -s "https://gist.githubusercontent.com/marvinroman/e54965b21b8f8d6b2640/raw/randpw.sh" > ~/randpw
sudo mv ~/randpw /usr/local/bin/
sudo chmod +x /usr/local/bin/randpw