Chapter 4 - THM Flashcards
whoiam
Find out what user we’re currently logged in as!
echo
Output any text that we provide
what option do we add to the find command if we want to find a specific file called passwords.txt?
Please type it out as well.
find -name passwords.txt
The find command will look through every folder in our current directory for that specific file
what is in the folder called /etc
This root directory is one of the most important root directories on your system.
The etc folder (short for etcetera) is a commonplace location to store system files that are used by your operating system.
what is in the folder called /var
var short for variable data. Is one of the main root folders found on a Linux install. This folder stores data that is frequently accessed or written by services or applications running on the system.
what is in the folder called /root
the /root folder is actually the home for the “root” system user. There isn’t anything more to this folder other than just understanding that this is the home directory for the “root” user. But, it is worth a mention as the logical presumption is that this user would have their data in a directory such as “/home/root” by default.
what is in the folder called /tmp
This is a unique root directory found on a Linux install. Short for “temporary”, the /tmp directory is volatile and is used to store data that is only needed to be accessed once or twice. Similar to the memory on your computer, once the computer is restarted, the contents of this folder are cleared out.
what is a PID
Process ID. Processes are the programs that are running on your machine. They are managed by the kernel, where each process will have an ID associated with it, also known as its PID. The PID increments for the order In which the process starts. I.e. the 60th process will have a PID of 60.
Explain the command ps
Use the ps command to provide a list of the running processes as our user’s session and some additional information such as its status code, the session that is running it, how much usage time of the CPU it is using, and the name of the actual program or command that is being executed
ps aux
To see the processes run by other users and those that don’t run from a session i.e. system processes
of course this is just a screen shot and not running in real time.
top
top gives you real-time statistics about the processes running on your system instead of a one-time view. These statistics will refresh every 10 seconds, but will also refresh when you use the arrow keys to browse the various rows.
Remember to use ctrl c to exit top
what command do we use to stop a PID?
how to we stop PID 1337
To kill a command, we can use the appropriately named kill command and the associated PID that we wish to kill.
i.e., to kill PID 1337, we’d use
kill 1337
