$ pwgen --capitalize --numerals --symbols --secure -1 20 10
3nuO;.4YLM7S0,.imemA
tjsI$<^j5_~wE%^xU}aT
B|D^3j0&9K<v]A+b-Qs[
YZ{!*b[W<`\F"VL39F52
h{eVVwv1ad~y9nTChAK<
t!'VnDWc]/9GR=D@DTRN
6+;vkd7"a\gC/mzT|@-U
?qn3)n5bc|l8-%M6ef[Y
NDrL^?ElBH5uf9xS!B5~
Btqk;7KVPAFIu}M&J#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/