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|
#!/bin/sh
#
# Copyright (c) 2019 Aaron LI
# MIT License
#
# Generate random passwords.
#
# Credit:
# * How to generate a random string?
# https://unix.stackexchange.com/a/230676
# * password-store:
# http://www.passwordstore.org/
#
# usage: generate ${characters} ${length}
generate() {
local characters="$1"
local length="$2"
env LC_ALL=C tr -dc "${characters}" </dev/urandom |
head -c ${length}
}
usage() {
cat << _EOF_
Generate random passwords.
usage:
${0##*/} [-n] [-l length] [count]
options:
-n : no symbols, i.e., only alphabets and numbers
-l length : password length (default: 16)
count : number of passwords to generate (default: 1)
_EOF_
exit 1
}
main() {
local characters="[:graph:]"
local length=16
local count=1
while getopts :hl:n opt; do
case ${opt} in
h)
usage
;;
l)
length="${OPTARG}"
;;
n)
characters="[:alnum:]"
;;
\?)
echo "Invalid option -${OPTARG}"
usage
;;
:)
echo "Option -${OPTARG} requires an argument"
usage
;;
esac
done
shift $((${OPTIND} - 1))
if [ $# -eq 0 ]; then
:
elif [ $# -eq 1 ]; then
count="$1"
else
usage
fi
for i in $(seq ${count}); do
generate "${characters}" ${length}
echo
done
}
main "$@"
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