Can I use multiple username files?

No, the -L option in Hydra only allows you to specify a single file for usernames. If you want to use multiple username files, you would need to combine them into one file before running the Hydra command.

You can concatenate multiple files into one using the cat command in Linux. For example:

cat usernames1.txt usernames2.txt > combined_usernames.txt

Then, you can use combined_usernames.txt with the -L option:

hydra -L combined_usernames.txt -P passwords.txt ssh://192.168.1.1

This way, you can effectively use multiple username files in your Hydra attack.