$ pwgen --capitalize --numerals --symbols --secure -1 20 10
Lq~6}(%F5E5(O"z,v+JW
y((>+\TYBoe3fiWD9Ts&
=]BeM_BYn)Z&?t[G*4Gq
LH>Q@^4~D{T1S:M\8CMq
5v4Y&A21|9)\C{F4".{-
;A4!*w'tA~07S"J(>YY`
g>Ny<6[{3aN(oQ-,r<3O
<SVcw!/V=)i%f9:i=8u4
UL-="m0&/=4#$7Z%N~\d
(U4uX8^w+YH:B909HFf*
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/