$ pwgen --capitalize --numerals --symbols --secure -1 20 10
W,QpYNl\mI38BCLbc2/c
,E1GHt1^KhSbJTKC?Ni"
]Z;i.T0!N7dv?4SS{/qm
O,OgjAmlW(`G$|$RYL~2
G_,7MG>e2/J{|)|n:]9/
L/LYyJZ=3C#is1c(*4z_
(6|2U$Og?-NF=61JS{Fr
ufQ+|m2E<w@_TK}Hi@fA
;LKK+5Il5BFhhx*\[tua
\nti:6]ULenf`!|C+1"6
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/