$ pwgen --capitalize --numerals --symbols --secure -1 20 10
gU%o`p1'(^{2QQ~i`tXV
1@>Kz|bYl.J(kPZ\/%OV
&|P&Qh6HAgHB_=d7Ou!q
E%\Vnf4SM<u"G=LqG^Ru
N7|z?aW]x5CkJGcK7tK.
=X#7??bU7Cp'l^Z\pS=f
Ab\'[gcJFb%]BA}K't2V
RI5rV%HB"|\`e'HvV!d>
)D4JKy,nYNLWB:>*BfxZ
ihSvq2uY$r7:#;ss~>iP
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/