$ pwgen --capitalize --numerals --symbols --secure -1 20 10
&8\U;.O#'Y;;8',7AxbN
srxC_r%GGhqHifwT/s!4
%suSql`2%d$JW{z+o<]e
g'%z;?FQq6#.Z`Uo(>Mn
Ur)}x:_xaF4ye44:NCgA
-zD%q0z;=Zo]zmB#yWFW
UXQCotV#j[L\|y-bY4\z
J|?:||L<*Rc,sw5.0P2"
UEQS^"SX8<hNW$(Sp;1j
i)A1HND)^$t?ioiE$L\R
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/