Shell Road "Fourth" input and output redirection

Output redirection

The syntax for command output redirection is:

Command > file or command >> file

In this way, the contents of the output to the display can be redirected to the file. If you don't want the file content to be overwritten, you can use >> append to the end of the file

[Email protected] ~]#W.H.O.Root Tty1 -- the-Geneva  -: +Root pts/3         -- the-Geneva  +: the(192.168.11.1) [[email protected]~]#W.H.O.>Output.txt[[email protected]~]#Catoutput.txtroot tty1 -- the-Geneva  -: +Root pts/3         -- the-Geneva  +: the(192.168.11.1)

View CodeInput redirection (< can be omitted)

WC -l output.txt2WC -l < output.txt2

View Code

grep TTY output.txtroot     tty1         -Geneva-:   grep TTY < output.txtroot     tty1         -Geneva  A:

View Code

Shell Road "Fourth" input and output redirection