$ pwgen --capitalize --numerals --symbols --secure -1 20 10
PG\fn7.;%#+)3~q1Q`KW
a)KZy>U/r\C]vg1.HR0m
?["RxB._gH?NYZ\e/x`4
$')fS+|LuVmis7VTQ#sW
f74<,VAav*JH/2*)4l(^
X+$l^r/@u'G*+4b@J32z
2I_KK0y|s|'=9"(?G}pu
bn&0Vk*1R'F^::0{cB!`
>1S`@DcE<C,|(DM'5,.g
:\N"mS+&g9{u/-&oV~JF
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/