$ pwgen --capitalize --numerals --symbols --secure -1 20 10
>B>_+%jDHY#2`17-,E0{
u;sAG_?e(r}X!G3`.u\z
;]=-}fzoym0MuHns/kPT
*dd<pVBuGg+E*Rr5$)a\
b[zycNx|cJ%BGg6qR_h'
sSL=yz%!G8AR\Z&p},F(
1y[B}cE&BB$.[mwwb%73
80}YXXs]Z{G0D:['Jum@
"b,wI&E<:dJ@.3d$H<$Y
:S/BnO!J/W}jm=hy"_X6
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/