$ pwgen --capitalize --numerals --symbols --secure -1 20 10
/7&k;LPAD[_Kix|+4mZ2
Hmt|)I_msZjT;l5r=BLG
<FC.9o$*na#7&B"<%|8m
Aw[F!k|\&wY;yl3&,HFM
h'^Yb,8,.RjM]C0H4uu5
#io.|w0fjqZ5x%5vM\2]
iP&RRw>c-#)M#gc*8A"7
q`JtrRH/y"XdmZ3W%;/3
Ino5_/zL+IJ0q7Z+f,-p
]KoG<s9UHC*u5\^%<}.T
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/