$ pwgen --capitalize --numerals --symbols --secure -1 20 10
w{`b3g:(<;[4_YRnyx!S
|oo:|F[g[fky4#+o5m\4
o=`'{t&dk;*XY@0dLP<K
Whx35[k%fEg#Uy$IJb?/
^Ms`iZd2*-(_aKkHiT|X
[i`[X)=/86Ujz*us`4+S
$j9tA0L7<1?LZ,-Fz~.?
N8G2Jt]HB98dVXu/o@a<
~zemu;=jG?1[M-1!>5qP
`k~u!HcxfmPjm9lG[l|E
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/