$ pwgen --capitalize --numerals --symbols --secure -1 20 10
A~bc7.yr<D.th'a0.+o,
,LZp}Kw)/L:gvrs6i`t&
A_b97N.,2cRL))yTaJ?1
f"l<Q'qd^+jK/V?7"|3m
tJM:MT*guFe:+0:Bdo)O
gku6nq6;?~uwJD2b_wMH
lK9!rxp+w{w@'+qzu(}F
:LgA}7U/^Ny2LE6'2CM@
A05:lC(x'=2'^jm.5jIi
M+T?,3N-()5j5]TS*&++
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/