Tells you what shell you are in. Yes, there are different types of shells but bash is usually the default and most widely used.
It will stop most things from running that have already started and can't seem to be stopped.
Exits the current shell session.
"clear" or "CTRL+L":
Will clear your screen.
Shows some options you have in bash by default.
"shopt": - "-s" = on and "-u" = off
Turns some options you have in bash off or on.
"shopt -s cdspell":
Minor spelling errors in a directory command will be corrected automatically and will automatically put you in that directory.
I.E., /tpm will be automatically change to /tmp (for the temp directory) and will automatically put you there.
"shopt -s dirspell":
Similar to the one above but makes a guess at what would be correct when it finds an error.
"shopt -s nocaseglob":
ignores upper and lower case typing.
Using the "TAB" key:
If you are not sure of the name of a directory try "cd /cp" then hit the "TAB" key twice. It will show you everything in the current folder that starts with "cp" such as "cpanel".
Move the cursor forward one word.
Move the cursor back one word.
Move the cursor to the beginning of a line.
Move the cursor to the end of a line.
"clear" or "CTRL+L":
Clears the terminal screen.
Shows you a file type. I.E., "file file.txt" will tell you that it is a text file. While ".Downloads" will tell you that it is a directory, because of the dot in front of it.
Finds files throughout your system. Usage - "locate filename". You may have to install it and/or update it's database using the following if the command is not found or doesn't work correctly:
yum -y update
yum -y install mlocate
Shows the full path of shell commands.
Search the manual page names and descriptions. I.E, "apropos time" will give you a list of time commands and a description.
Will show you a list of users who have successfully logged into your server via SSH within the last 24 hours.
Will show you a list of users who have unsuccessfully tried logged into your server via SSH within the last 24 hours.