$ pwgen --capitalize --numerals --symbols --secure -1 20 10
;{/N8$COR:OV}k~8h"<R
qzJ9^N3)g_L|xFcp},""
PWlS0"0;#SbNkAQN_gIw
C'ZPVw(9Z[UC/lC}lL{^
G|b;B([Es`D[c}~vk3'W
JaP4?E8m=L)+bdjk!V20
tk&2Ob&]Q/!tl0m",6iv
?}cUtIcHvR}'ZDo4Lfg{
!u*s0RmTp|0I}q@Xxi](
/}d8^2BIK`(V9iy+E>gk
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/