$ pwgen --capitalize --numerals --symbols --secure -1 20 10
llQlRUn!\ar3Dz9Jv=S-
G"9mY?J3Zy|e{NVVEHGA
}0Q7|eu_a&1I$gQ@8o)Y
EN:"BZ4t?k]A:Yay+imT
qQ}V^jfI+TVk:GmCM[&8
v5y=2tx-b\K$ql<NgF[]
;Lh#Zo|-5Z>@{ouG^*ZH
2j<X9,M<xb[2Q97Cp]x%
PF!7]'1~w+0Z!6,(.2W-
(.3Y28+R+ROBDI{-##RZ
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/