$ pwgen --capitalize --numerals --symbols --secure -1 20 10
_\Iw}<8D;&/WiLj)r'2{
t@[]rLDKVwdkL4tf|Wup
&;gdWb'<,!1".qBL0fw(
Um@^umG(j8_b:7}=Q2pw
X-gX4bX@tUiG8^OVO#E`
v#]%BvAtC_YTn!48AIgR
]5/`qjvH]/^`s7#mhERB
vQ5eH/p.'F__xx(ptB>)
4}VHF\QW'4ng}&?+0'^q
."_=ZyW6o?j.|aF,}4:(
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/