Linux Learning notes-pipeline and IO redirection

Pipeline and IO redirection

Arithmetic, controller: CPU

Memory: RAM

Input/output device I/O

Programs: Directives and data

Controller: Instruction

The arithmetic device:

Memory:

Address bus: Memory addressing

Data bus: Transferring data

Control Bus: Control instructions

/ o:

Programs: Directives and data

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 Error Output: Display

I/O redirection:

Linux:

: Overwrite output

>>: Append output

SET-C: Disable overwrite redirection for files that already exist

Set +c: Turn off the above features

2>: Redirect Error output

2>>: Append method (redirect error output)

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

<: input

<<:here Document

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

Command 1 | command 2 | command 3 ...

Tee: Reads the standard input data and outputs its contents to a file.

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Linux Learning notes-pipeline and IO redirection