$ pwgen --capitalize --numerals --symbols --secure -1 20 10
/B7MFU{iLt_(,TV.!2XN
M[XUZJ%/y#AK;V.I1v1`
V+`pGT4O^ej-p%jo`ZE5
]q<Z04(KfOzz@ZgDmli)
6#u6x2(5BAKVSfu7ecMr
}9s$[Ni25?-c$mU'uVKZ
BeM|TG\';(|KT]0YGL(\
ueF}`AaZ6,"S#E{hS5mf
M$GU*f8zvN-m]rXS.SH@
);s7*5WeQfDfW|^v?Iz5
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/