$ pwgen --capitalize --numerals --symbols --secure -1 20 10
r+vA`E}-1Fa_In1qwh<n
zSxDL.][&/cyxsIDRfH8
uQnE-Y1F}|pcTH?/Ne,i
.C_S|7^Az#O32#$nwKZ8
G7="O)Qrl[~1<Z60wy%?
[z=T.Cp9=1S6ET"eb$VB
&tW,LG7RPh=:Og/zA8=1
t_w<qs"b;~4F1uxMXJlz
G"SP5ZP7X"$iy=![,hpg
Vmq\Tg"tXprW6:ILU2B#
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/