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Editor to share with you what is the use of the tee command in Linux, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

The Linux common command tee command is used to read standard input data and output its contents to a file.

Tee reads data from standard input and redirects to standard output and files.

Summary tee [OPTION]... [FILE]... The main purpose needs to be used when viewing the data content and exporting it to a file at the same time.

Parameter FILE (optional): the file to output, which can be one or more.

The long option is equivalent to the short option-a,-- append is appended to the file rather than overwritten. -I,-- ignore-interrupts ignores the interrupt signal (Ctrl+c interrupt operation is invalid). -p diagnoses errors written to non-pipes. -- output-error [= MODE] sets the behavior in the event of a write error, see the MODE section below. -- help displays help information and exits. -- version displays version information and exits. MODE determines the output behavior when a write error occurs. The available MODE is as follows: 'warn' diagnoses when writing to any output. Warn-nopipe' diagnoses when an error is reported when it is written to any output (not a pipe). Exit' exits when writing to any output reports an error. Exit-nopipe' exits when an error is reported when writing to any output (not a pipe). The default MODE specified for the-p option is' warn-nopipe'. When'--output-error' is not in the option, the default action is to exit as soon as an error is written to the pipe, diagnose the error message, and write to the non-pipe output. The return status of the return value is successful unless an illegal option or parameter is given.

Example # outputs the process information to the standard output (terminal) through the pipeline and overwrites it to the file. Ps-ef | tee info_a.log info_b.log # pipes the process information to standard output (terminal) and appends it to the file. Ps-ef | tee-an info_a.log info_b.log Note this command is a command in the GNU coreutils package. For more information, please see man-s 1 tee or info coreutils' tee invocation'.

There is a caching mechanism that will be output once every 1024 bytes. If you receive input data from a pipe, the buffer should be full before transferring the data to the specified file. If the file content is less than 1024 bytes, after receiving the data read from the standard input device, the buffer will be flushed once and the data will be transferred to the specified file.

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