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Detailed explanation of linux tee command

Function description: read the standard input data and output its contents into a file.

Grammar: tee [- ai] [--help] [--version] [file.]

Note: the tee instruction reads the data from the standard input device, outputs its contents to the standard output device, and saves it as a file.

Parameters:

-an or-- append appends to the existing file instead of overwriting it.

-iMuri or-- ignore-interrupts ignore the interrupt signal.

-- help online help.

-- version displays version information.

[root@localhost ~] # who | tee who.out

Root pts/0 2009-02-17 07:47 (123.123.123.123)

[root@localhost ~] # cat who.out

Root pts/0 2009-02-17 07:47 (123.123.123.123)

[root@localhost ~] # pwd | tee-a who.out

/ root

[root@localhost ~] # cat who.out

Root pts/0 2009-02-17 07:47 (123.123.123.123)

/ root

[root@localhost ~] #

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