$ pwgen --capitalize --numerals --symbols --secure -1 20 10
JnD'L|jX`o4]`erltEUn
]X?)4w'j$F!m3]&cY/p^
L2Yuw3$C{eBNQQ>UjsXH
}YpBuF)3]z2's$W.~.iM
%&3fqO].}vRfw3YSS{zt
c}WW;c2L?!LAqbJ-,l[[
N8vvmvK0im)0JJGA]Dh%
cE6=:XcK8t-W+9/YE<mm
j$6H1<?+;)m/kQ:=tvCA
y0(^lxnY#PKMZrn(D$T[
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/