$ pwgen --capitalize --numerals --symbols --secure -1 20 10
4@~}hn1*Dy_J#A"Flf>]
ql9QzIvaj9r?9bU2))_h
aB}{@^;~|0juE9$A%eTT
]4Qa)V(W:&IcV6Bw^I3\
h2;uGyznOIu1K9S7+5&L
<5X>A.lo][#+B3\2I{S>
d)0(ai{mOT!a4,pv,mI5
<;9w&76}GV)z^x3.:L/q
]l+<4h4KE}]dYX<P7r(}
JfQurfSv-U|BMlGxoR3L
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/