パスワード用にランダムな文字列を生成する

mkpasswd

#!/bin/bash

print_help () {
  echo -e "Usage: mkpasswd [options] " 1>&2
  echo -e "  -l\tset password length" 1>&2
  echo -e "  -n\tset number of passwords" 1>&2
  echo -e "  -h\tshow this message" 1>&2
}

while getopts n:l:h OPT
do
  case $OPT in
    "n" ) NUM="$OPTARG" ;;
    "l" ) LENGTH="$OPTARG" ;;
    "h" ) print_help ; exit 1 ;;
      * ) print_help ; exit 1 ;;
  esac
done

cat /dev/urandom | LC_CTYPE=C tr -dc 'a-zA-Z0-9' | fold -w ${LENGTH:-16} | head -n ${NUM:-1}