31 lines
667 B
Bash
Executable file
31 lines
667 B
Bash
Executable file
#!/bin/bash
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print_help() {
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echo "Usage: genpass NUMBER"
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echo "Generate a NUMBER long password using the characters _, A-Z, a-z, 0-9 exclusively."
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echo " -h, --help Display this help message and exit."
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}
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pwd_length=
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while [ $# -gt 0 ]
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do
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case $1 in
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-h|--help)
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shift
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print_help
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exit 0
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;;
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*)
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pwd_length=$1
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shift
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;;
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esac
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done
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regex_number='^[0-9]+$'
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if ! [[ $pwd_length =~ $regex_number ]] ; then
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echo "error: '$pwd_length' is not a valid number" >&2; exit 1
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fi
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cat /dev/urandom | tr -dc _A-Z-a-z-0-9 | head -c ${1:-$pwd_length}
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