Linux commands (ix) pipeline and I/O redirection >, >>, 2>, 2>>, &>, <, <<, tee

REDIRECT:> < >> <<

Arithmetic, controller: CPU
Memory: RAM
Input device/Output device

Programs: Directives and data

Controller: Instruction
The arithmetic device:
Memory:

Address bus: Memory addressing
Data bus: Transferring data
Control Summary: Control instructions

Register: CPU Ephemeral memory

I/O: Hard disk,

Program

Input device:

Output device


System settings
Default output device: Standard output, STDOUT, 1
Default input device: standard input, STDIN, 0
Standard error Output: STDERR, 2

Standard input: Keyboard
Standard output and Error output: Display

I/O redirection:

Linux:
: Overwrite output
>>: Append output

SET-C: Prohibit overwrite redirection for already existing files;
Force overwrite output, use >|
Set +c: Turn off the above features


2>: Redirect Error output
2>>: Append method


&>: Redirect standard output or error output to the same file


<: Input redirection
<<:here Document

Pipeline: The output of the previous command, as input to the latter command

Command 1 | Command 2 | Command 3 | ...

Tee: From the standard output to the screen, a copy saved to a file

Linux commands (ix) pipeline and I/O redirection >, >>, 2>, 2>>, &>, <, <<, tee