$ pwgen --capitalize --numerals --symbols --secure -1 20 10
?DhM!6|[^g(b{HeNY^H`
71mCfYIB2ql!3^,v9dh<
jA}EZe`!<[u8E>s4vLM0
{a'60]Z7yD&V$WPnCR.#
,2[KS5R`0}q`S_KDwmSr
zbX]?2?\Z_Tf-]3L=oSO
kQRkulHCV,W4):~@?j_+
$4y{$IX|9R*sir6);tSf
fm'K1Gw5i9Etp-E%/^MD
mpaCC2>@TIQB-PL{ayVQ
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/