$ pwgen --capitalize --numerals --symbols --secure -1 20 10
Tm\eC"l*+{ux@#.u9ez'
[B2Ta4d<c?Vb?^Y~i!?%
Z~k'P6<qXnN'mj3U#'Iu
8l-wv-\g6CX56TL){zVH
L)@QaI]F59Lg{^N?65^v
b$7$wyo#%e!?hu9ek^H-
t@`3/#&Th(f}3TxEHh<-
<(?-MP/xhsxy>4)HiL@I
sC}!(lfm)/;0>hy!Ex9-
C#XOS4;S*#9'hU[Cx,-y
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/