$ pwgen --capitalize --numerals --symbols --secure -1 20 10
U9vHveKnfQvyoXW/P*4Q
`8|4=}VD9@X/AYk-,nOU
?zlIG9n"=d[t}d4?voB\
=A'Lx17ruI+eVLmuNuA=
1H6[1+UJ=H@is"F'{c45
3iX&JHmBH(^/+WO%d5.#
D~*Mj#$~4zD0iJ~Rb5|N
^okUoq-Tg}.@C%WAm9.~
[LW5ynwz@Fs@}|"?7UF!
5cqjZ(%iAf5GD)}*n+fV
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/