I'm not a power user; I don't get too much time to learn about command lines. I'm using Ubuntu to browse the web, play the Steam for Linux beta, and do some image editing.
I recently installed avast!, but in order for it to function properly, I was told that I needed to edit
/etc/sysctl.conf and add
kernel.shmmax = 128000000. So I'm wondering: How do I know if a command is safe? Sure it fixes my problem, but what else does it do? If a user with more than 5k rep uses it, does it mean that any command he gives you is trustworthy? I'm not gonna enter every command I see. I'd just like to know if a simple command (as the one said before) could open a window to an invasion or any other vulnerability. I didn't find anything on Google about that command, so is it safe?
I'm too nervous about getting hacked. On Windows I had Kaspersky Internet Security, now I'm alone with avast and clamtk (both only scan by demand) and bitdefender (bootable CD). My games and software are all genuine, but I torrent legal content. I just want some additional reassuring.