$ pwgen --capitalize --numerals --symbols --secure -1 20 10
j~js/7OBHQWpfx[KSk}y
3@*CoOl!9sp>znhMux8W
\}vz.A;ILXuoWlh3Gt%I
`:o5i?>g+v7Ok\l\Dq|[
c6t0_I`5fwOG~Q54b6t<
'B.f8&}EfhmuasKV=L>g
-'+(xClN$s|qWG;B0vjh
m1@6g8U(~m]tPX[A\Cp;
b^"D3w4nVlGJekmkj-m2
OK(_M+6BAqQ:_*!)m+?G
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/