$ pwgen --capitalize --numerals --symbols --secure -1 20 10
.#P1<;paY.-6d++hno{*
+{&bQaqgdet8Rg|4bR,V
6+Jf!*QIs_S0hG6gfZ47
#}K`*s^3b)CF;9So:ObD
aM=wO?B8!}NRB:[}:D'p
<S>?I0AwY}<G>Aeg4G)z
")n#&e;o&z;X0KZ}dm=*
SQ'OBT]}tB8Ha1r;m/:M
,3y><bCGfdOAD~wZ><tW
d5f6c$,xK1SI*(\7ZliH
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/