$ pwgen --capitalize --numerals --symbols --secure -1 20 10
|<sO5eBJN~F`5#M"W/3s
K4R(-r7B{%Dll]P9gz3.
KHj+#m5bO/LjN\O(:u%:
ZeY~@&[{Eg5oed_)mMw2
.:xd4TP[f^ym*zL2-HzC
^S%<6]rlKIkbpfUeF2#C
`2N+[|v<yh':V&70R\VZ
)s\.6"qnSf/L5lwvxfNE
o~^AM@XL+gUu`!Q!)xP5
&?cyp!C%Cvu_x%oW59MD
Usage: pwgen [ OPTIONS ] [ pw_length ] [ num_pw ]
Options supported by pwgen:
-c or --capitalize
Include at least one capital letter in the password
-A or --no-capitalize
Don't include capital letters in the password
-n or --numerals
Include at least one number in the password
-0 or --no-numerals
Don't include numbers in the password
-y or --symbols
Include at least one special symbol in the password
-r <chars> or --remove-chars=<chars>
Remove characters from the set of characters to generate passwords
-s or --secure
Generate completely random passwords
-B or --ambiguous
Don't include ambiguous characters in the password
-h or --help
Print a help message
-H or --sha1=path/to/file[#seed]
Use sha1 hash of given file as a (not so) random generator
-C
Print the generated passwords in columns
-1
Don't print the generated passwords in columns
-v or --no-vowels
Do not use any vowels so as to avoid accidental nasty words
https://sourceforge.net/projects/pwgen/