$ pwgen --capitalize --numerals --symbols --secure -1 20 10
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69EDa>AI({N++2V7xhXm
|PYgpn!{Ta-(2h/)%(QT
\fN>:e1|GNqj@$><8[oP
\rUL%-=j6cNmqk{q/pL7
rMwB?j3nQG7&d"~rU(j:
H+v4l{l>lSjWAJB0{~^\
&4&k[{Ks:R,+Vdb7^),`
O?gg(=13DoQF+Z~O~6v>
L|t/"_F^.rOVc67-"vd?
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/