$ sudo chmod +x ./passgen.sh
$ ./passgen.sh [option] [value]
You may call the script without flags and it will generate a password
between 16 and 24 characters long in the "graph" character set.
$ ./passgen.sh
or
$ ./passgen.sh -n 16
or
$ ./passgen.sh -n 16 -c graph
Password Length: 16
Password Charset: graph
@hA}x8GQtNJ6u_)0
| Command Switch | Effect |
|---|---|
| -h or --help | Shows help and exits |
| -n or --number | Modifies the length of the password |
| -c or --char | Modifies the character set |
| -s or --silent | Silences all optional terminal output |
| -m or --min | Sets the minimum length of the password (must be used with --max or unexpected lengths will result) |
| -x or --max | Sets the maximum length of the password |
| -g or --grep | Uses grep as the engine to select random characters |
| -p or --perl | Uses perl as the engine to select random characters (default engine) |
| Variable | Charset |
|---|---|
| digit | Digits: 0-9 |
| lower | Lower-case letters: a-z |
| upper | Upper-case letters: A-Z |
| alpha | Alphabetic characters: lower and upper: A-Za-z |
| alnum | Alphanumeric characters: alpha and digit: 0-9A-Za-z |
| punct | Punctuation characters |
| graph | Graphical characters: alnum and punct |
| Printable characters: alnum, punct, and space |
Add an entry in your .bashrc or .bash_profile file to alias this command so that it can be run from anywhere.
alias passgen="/path/to/script/passgen.sh"
Don't forget to run the following (or similar):
source ~/.bash_profile
Or, if you want to use the output in another script:
myvar=$(/path/to/script/passgen.sh -s)
passgen