$ pwgen --capitalize --numerals --symbols --secure -1 20 10
5tcGN]@]n/yc4+$*loSG
L$"2wkSq0I[7sbff8[Vr
`3wG3})S#F3"fWrbf.C0
'W9@eS$*PoWb{p@kiNm4
[82zh<_9[Op[CMM30"gl
2=?qU1y.).UYR3-\(aQ_
x2IEHk`-.#6?k*9wa|nk
vhdz2"IzO[g*Qp%QSL?,
J.s+6$b5:gL8[Z-W6zyJ
RG,`r8N1ZfF)ct~T@'P.
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/