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The tee command is used to redirect data to a file and, on the other hand, to provide a copy of the redirected data as a stdin for subsequent commands. To put it simply, redirect the data to a given file and screen.

How to use tee

The most basic use of tee is to display the output and save the content to a file. The following example uses the free command to display the system memory usage information, and uses the tee command to output the information to the screen and save it to the file mem.txt.

[root@localhost ~] # free-h | tee mem.txt total used free shared buff/cache availableMem: 1.8G 164m 1.2G 9.6m 387m 1.5GSwap: 2.0G 0B 2.0g

You can look at the mem.txt file and see that the output has been saved to mem.txt.

Write to multiple files

Tee can write to multiple files, each separated by spaces.

[root@localhost ~] # free-h | tee mem1.txt mem2.txt mem3.txt total used free shared buff/cache availableMem: 1.8G 165m 1.2G 9.6m 389m 1.5GSwap: 2.0G 0B 2.0G append content to the bottom of the existing file

The following example uses the option-a to append content to the bottom of the file without overwriting the original content.

[root@localhost] # free-h | tee-a mem.txt total used free shared buff/cache availableMem: 1.8G 165m 1.2G 9.6m 389m 1.5GSwap: 2.0G 0B 2.0G

As you can see, new content is appended to the bottom of the mem.txt file.

If you do not want to output content on the screen, you can use > standard output symbol to redirect to / dev/null:

[root@localhost] # free-h | tee-a mem.txt > / dev/null the above is about "how to use the tee command of Linux". I believe you all have some understanding. I hope the content shared by the editor will be helpful to you. If you want to know more about it, please follow the industry information channel.

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