$ pwgen --capitalize --numerals --symbols --secure -1 20 10
SR7-!UGJl[wo<T"FXM?J
Px_H9AA/Ij)-F6Q,#AUc
fN#<IdfIqy-cC*'#'u3K
#_s.=n4i_Zmc`9y@|p4g
q+:8+DU9|_w%eHA=}&Z(
h<zC_`ZvIz+7d&XcGBg|
w<2UqIN]mW$=SLkbk-A|
do14q?`G5s1H{[eHu="m
G!_uO":xZ*al3,n9#J`?
%3`P*]7{e(v>+tql)Ep4
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/