$ pwgen --capitalize --numerals --symbols --secure -1 20 10
F$g2m/lcL{9IF2h0(nHp
IQqcD2>crV@y!-)@>vE3
!q"$~8&+Vho]n^GDa-Aa
v+<h9`F4R;F&HtNfC2_#
ltW]|6u"4R"vFffo+\j(
LAJ-'*1m!t2t!5WR9+$-
vW.gaJi@W.1dh=tpx%l2
;}{uWk1Ahe"A{$).jQVH
^+q1oqrKrQ611ZNhw-[J
h5+!F8[dk*#5Z;n"q`#i
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/