$ pwgen --capitalize --numerals --symbols --secure -1 20 10
!i7vS=2#sf_pMS,x_!~d
<6uappmcHZ}<ZpoB^8z@
KN#"eXR1K3~i<"6/Xq12
4w/_gQ[^@n9^Ot<Ex+O=
('@t;4]X`="2(`fG%<!v
EvRIbCJyO7r:C~~^6j^8
IWmu^GNo6~:r*E8hU}mh
)DL8"l3Iii3v/};nlv_Q
x(nSFH|9(ylyssokHn7#
z>:o'D|P+3nujNp%@l64
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/