$ pwgen --capitalize --numerals --symbols --secure -1 20 10
]NR;&+'9!x~16dR9I^6^
78GAw-9oy0OuYWeeoprt
j|h@7eD#sDB;DxY_/4h<
T3|lfYP%l(@4s'F%*Dsm
93y"`V!w&Gg]*k(e9pbs
XNl\/9=&U_Ux:4Mo{7:b
'Oj/,0MtF|:mXF+z:bs1
^W^%qo3{OcExh],GDRYd
J~]_?2e5/V@J+rx[;a:T
*]~_!KqzR4Qc:k"Q=3qE
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/