$ pwgen --capitalize --numerals --symbols --secure -1 20 10
hIrJ)qUr%={L<P|GDJ;3
)Kc.{qCem{n*~R9j5E:U
r=0#f,mI%F_n|y]*qlUl
qI>-5J%X)4G=*o#YOy|L
WPJg9t5l(hqE:|~y~uX$
(oxrOwiYWMz*g5};iw@^
<z+NNJQalVM#k<4-[if1
>M2K*['MMMA%GS]<&g"K
/C>,Pjf}ueA,5ujYZsx^
KyPf4dq=-7o3jQ/L,ah=
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/