$ pwgen --capitalize --numerals --symbols --secure -1 20 10
I[9^x5M?<*#T,L.\H'{;
&f2]].}y-lJKCS}G&_Ur
^Aw:\W,:cy3KcS"*D?$4
g8|fGEx~=YZ8y2-6Ng{;
PDtp17|90+}[|u{^-:H?
>q5=F=Z=;VLsA|Eq2DZT
`'VpX%AO5]K|/.ZF!wo!
*RX6hH<Xb|#2F)pxh{Hx
8yEr2SU3a~c.bMnMeK=$
oUUW:8x/D6Q7Wv|Nbv"g
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/