$ pwgen --capitalize --numerals --symbols --secure -1 20 10
B~0.5oyL.+)JRbDxc%ra
+oRXq5AkLXKkmO7#NRF0
\]Ob_Q"x/?hDp5mQS_$;
;@LR{g9b4#2$5y=@')]~
]mSi~5~%>4cb9R9j:VL"
h3b(s,<wZ1F7L9lxuo@r
2"*cb#Kr;~#M"'48e6/$
oM!UuwbJT#gp4F`!6:x`
kjb]5$86@vekqM%XR1/<
'SC7-Cr/n^CKvO]u?`t6
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/