Mastering Bash

C-a	Move the cursor to the beginning of the input line.
C-d	Same as [DEL] (this is the Emacs equivalent).
C-e	Move the cursor to the end of the input line.
C-k	Kill, or "cut," all text on the input line, from the character the cursor is underneath to the end of the line.
C-l	Clear the terminal screen.
C-u	Kill the entire input line.
C-y	Yank, or "paste," the text that was last killed. Text is inserted at the point where the cursor is.
C-_	Undo the last thing typed on this command line.
[←]	Move the cursor to the left one character.
[→]	Move the cursor to the right one character.

< CRTL > + r for Search in terminal command line

"This is used to search already executed command in Linux terminal."

We waste timings by retyping the command often for a small argument changes. But this is not worthy, Hmmm you can use CRTL + r to searching the already executed commands.

USAGE:
Press CRTL + r and enter text to match the already executed command. Matching results will be dispalyed, so now you can reuse them.