$ pwgen --capitalize --numerals --symbols --secure -1 20 10
"}sx_5}nOe&E:M8/>(vo
^vmw9;!19yGyS<W]bK@G
RhP[U+;tbNbO&5qS;eO!
5g)~Un32d\Y1PMSqQl((
C}{]Npih3b20!RZ-+X@5
!LSELm~E2B'{YsNb%x>1
,h0C)7i&or-F8@[aanft
kcaUmXBa:APQ!+/`5~}F
Ls+zTgJ&PjP>=pL"d1L-
2E$=#xGkM$f_F^tDf,zh
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/