$ pwgen --capitalize --numerals --symbols --secure -1 20 10
63>e]M/Zdll}<)jGd#^n
;)&(YL6PzL#-$z#}n&:V
Aye!grLTyRKg(9uisX\<
Hc^[46b'{S;@qa8J}h[B
?m}*EBp^XU22|BGK6Tv2
a5vAcW>%BWsUnjN"WdMW
y4_yRTE]p23"O;M^1wpC
"8PY&l<NN@NH6VDsiIy8
SWC+Wx1t)?WF{,QJop.n
YJ2pnc<@f_e3_XE^T`[4
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/