$ pwgen --capitalize --numerals --symbols --secure -1 20 10
9!!r9)vc{xIz`$[|nU5?
Rado0<mjM,Eogo9nhg`'
@~\1o=Q{a6VJVx>%S4G(
U*K(#*1G3Oqqf`z&{p|7
%]P,${31Dt]dobd~8b,.
;/RgS'YX`Et|{M?u9lsz
pJ7%Ogzb=xt`&)}dt}M{
M\5}|Nu,[x#dHPNFpK)7
arX3nm1BT.3X~Al$vny]
yt<'^G:n$o.p(Eh7>?=7
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/