To answer #1, yes, those are commands and you'll need to enter them in the terminal, using enter to run each line. Your password will be requested for the first sudo, but will (usually) be remembered for the second.
To answer #2:
sudo mkdir /etc/hal/fdi/preprobe creates a directory preprobe in /etc/hal/fdi/; the next line also creates a directory.
I don't know what the third line does, but in the spirit of teaching a man to fish, I'll show you how to find out:
- The first part of the line (/usr/sbin/hald) is the path to a program to run, in this case, hald.
- Using that name, we can find out what the command does by typing man hald in a terminal and pressing enter. A "manpage" should appear, providing information about the command. Check Wikipedia for more on manpages.
The fourth line deletes the hidden directory .adobe in your home directory. In *nix, a dot at the beginning of a file/directory name generally hides the item. rm -rf recursively deletes a directory and forces deletion of all its contents. As with hald (and mkdir and sudo), you can use man rm to find out more about the rm command.
A quick personal note: If you're not familiar with the terminal, it's well worth getting acquainted. It's super-powerful!
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