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pw.sh
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pw.sh
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#!/usr/bin/env bash
##
## pw - generate password(s) of configurable length(s) using "pwgen"
## Copyright (C) 2020-2023 Daniel Haase
##
## This program is free software: you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program. If not, see <http://www.gnu.org/licenses/gpl.txt>.
##
# shellcheck disable=SC2310
set -o errexit
set -o nounset
set -o pipefail
set -o noclobber
NAME="pw"
VERSION="0.3.0"
DEFAULT_LENGTH="${DEFAULT_LENGTH:-31}"
DEFAULT_COUNT="${DEFAULT_COUNT:-1}"
function check_command {
if ! command -v "${1}" &>/dev/null; then
echo >&2 "no such command \"${1}\""
exit 1
fi
}
function print_version {
cat <<-EOF
${NAME} ${VERSION}
copyright (c) 2020-2023 Daniel Haase
EOF
}
function print_usage {
print_version
cat <<-EOF
usage: ${NAME} [<length>] [<count>]
${NAME} [--version | --help]
<length>
generate password of <length> characters
(defaults to ${DEFAULT_LENGTH})
<count>
generate <count> different passwords of
<length> characters each
(defaults to ${DEFAULT_COUNT})
-V | --version
print version information and exit
-h | --help
print this usage description and exit
EOF
}
function fail_usage {
print_usage >&2
exit 2
}
function is_number {
declare -r number_regex="^[0-9]+$"
[[ "${1}" =~ ${number_regex} ]]
}
check_command "pwgen"
declare password_length="${DEFAULT_LENGTH}"
declare password_count="${DEFAULT_COUNT}"
if [[ $# -eq 1 ]]; then
case "${1}" in
-V | --version)
print_version
exit 0
;;
-h | --help)
print_usage
exit 0
;;
-*)
fail_usage
;;
*)
password_length="${1}"
;;
esac
elif [[ $# -eq 2 ]]; then
password_length="${1}"
password_count="${2}"
elif [[ $# -gt 2 ]]; then
fail_usage
fi
if ! is_number "${password_length}" ||
! is_number "${password_count}"; then
fail_usage
fi
if ! pwgen --capitalize --numerals --symbols --secure -1 \
"${password_length}" "${password_count}" 2>/dev/null; then
echo >&2 "operation failed"
exit 3
fi
exit 0