Generate password with bash

genpwd.sh

#!/usr/bin/env bash

# This generates a password

# The MIT License (MIT)
#
# Copyright (c) 2015 Florin Patan
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.


read -p "Password type (normal/rds) [normal]: " passType
passType=${passType:-"normal"}

read -p "Password length [38]: " passLen
passLen=${passLen:-38}

echo "Generating ${passType} password of length: ${passLen}"

if [ ${passType} == "rds" ]
then
    </dev/urandom tr -dc '1234567890QWERTYUIOPasdfghjklZXCVBNMqwertyuiopASDFGHJKLzxcvbnm' | head -c38; echo ""
else
    </dev/urandom tr -dc '0123456789!@#$%^&*()_+QWERTYUIOP{}|ASDFGHJKL:"ZXCVBNM<>?qwertyuiop[]\asdfghjkl;zxcvbnm,./' | head -c38; echo ""
fi