$ pwgen --capitalize --numerals --symbols --secure -1 20 10
4ePk5{6.,f35oK'F-Y`2
Rpf?~>M0@>#.5cmqL6sT
pFu2<X?Ae<eDy(zQ(V2e
KwQ\^ICq&~A)3lXdkq~#
4|&D}`U.(4&}mCcc&4p;
Q[QT+!xzA8-`Ji!G)crm
&|*pcqeH3@>bLTAPT^hG
\pZ\*tSC|\ibn,G}U5Lb
oio[}1B4.9pc!Nq9q4X1
6Y],qHggPG\[v&,W{'gg
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/