$ pwgen --capitalize --numerals --symbols --secure -1 20 10
;5LeimNBdtS6.mg#Hi~V
&Kg8vZy\3ODy?@Gt1(m)
_U2,=KLAlP}0z0]v+,8E
J#~@1ahu-O6u8n*by;t|
abRBzd'ApQ,aKQD3Jk?b
&.=(+=|75]hY2C[G.<G6
1GXp="cYH0Y<["62h8`O
#5l7B<GRVD}PWt5C75&n
e7uA5:l|+;l4W29(]GT&
YKY@"dfBJ2![X\aa?CCM
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/