$ pwgen --capitalize --numerals --symbols --secure -1 20 10
y8J\a>58wO2Y\zeOqA>!
Df,7;}Br~SyY5/B9lPU<
$w#L.Q^nc:}MS3#q]S}8
}`^.]vl?13NS{Cl]%]A2
4H/h|xhg=2UBM6cI9~5i
{BS=h]]dn.43y73u!S?%
5Tu}/5j/g>RCI;B{]Sus
0uU2jNz,Sy?uc9,-G~i`
/BfiD)B)/vbX6`"fxZx5
*CiSMZIC9Ks,s#=1Bn^*
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/