$ pwgen --capitalize --numerals --symbols --secure -1 20 10
cQwI@mmL^%iK$7TybX/T
8\DG9r6C@Rgm#YV?j8{b
P}[:yyBD%6MEa"8mN[zz
S$2eo,[U,{ZS:vBEOLBC
bN,ViPXB};jUGC$CX5TS
hn&~U>&bs_94JLLRSsUz
-segU$BK*k3e18'Z&QRR
[A1bpn3lLV+,Mds(:Ny/
t:Z}Lt4]aWeldj1ddn:.
su$QN,fdFUuw(iBU13`f
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/