$ pwgen --capitalize --numerals --symbols --secure -1 20 10
PcRfM:z)0]B(g+10pXSf
njjBup<}zk-Z0KzH.#u;
<z6/63"4#dw0-^ltB~4$
-eoC'lX(BuPM8?[CSa6e
VTSvFm6auMsf_n~}I/l#
yQ8M,B9qB=aSRaoa4+uv
.WwpzhxbN}}I7{b4B_Ws
]l435EMd%fQ0_6M/mn}D
A"Z97|H%s~)Ok{av^0rq
ZXR=4E"Lh:{Ew^sY_9N=
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/