$ pwgen --capitalize --numerals --symbols --secure -1 20 10
U/qgNZTXLTuK9uyq];G=
Ij44.D=Xm:;`jmG/;NXA
HvUU3NXyRn7l!V,LAcsT
g0h="wCivB'zdO.7Z?Li
Zr0[R{~8\-YW*dJH=&"&
sewtUmeL(r!V9MmZo$I,
6Qudm7T]:=RZsL{WvjI5
KDz6.mK"slLI~>R]kn"h
Q2}k<Xw}Au\DkF0)(z[v
"W<zl#~8~)M*>:)Q]?CU
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/