$ pwgen --capitalize --numerals --symbols --secure -1 20 10
U21jeFZkGh*K2{2}k2jP
7/}6!gV04sh:h5P4Qc69
I<4sd*DwEl6}75U/ZHBn
\;z0{Z8,,uY#qjYar3UG
b^a}~A1dsAf]*krRFG.i
*ppj7.eNS+$m|nE)y!(@
d]ER@#ltIS^4OQH%y3>j
8U/g(p<6NuMJ[HO3(CTk
6#\@KU$nQq"ASfa:RxTd
4cT/Bs&@t@I"o8TtoiDq
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/