$ pwgen --capitalize --numerals --symbols --secure -1 20 10
Q7eZ]8<0$GNyW57*V=`?
(deAgW~DQJ2P@5bbcXG_
^:0(/+"!N4Psx24zkh9u
g(ztCAbJ"knBz5+p9B}h
Ztudmn8&:"#qQD&G)b+~
Hu-'Wo6<<C,cqJ{4DbTs
qi`]G51x`VP`n~2)N0mE
9u8;M{fOai8O<)-t=.sL
CTnZ0YAbGL]EE{2y^q@$
)}'Nu+P[`[(46kULi%T{
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/