Linux tee command detailed introduction and practical application
Linux tee command is a commonly used command line tool. Its main function is to read data from standard input and output the read data to the specified The file and standard output device, that is, the output content of the command can be passed to the file and the screen respectively. In this article, the usage of the Linux tee command and practical application cases will be introduced in detail.
The basic syntax of tee command is as follows:
tee [OPTION]... [FILE]...
where , OPTION is an optional parameter, and FILE is the file name to which data is to be written. Multiple file names can be specified at the same time, and the tee command writes data to these files.
-a
: Append mode, append data to the end of the specified file;-i
: Ignore the interrupt signal (SIGINT), that is, do not end the tee command when typing Ctrl C; -p
: Do not ignore the standard output of the tee command and files that conform to regular expressions Cache and write the data to the file immediately; --output-error
: Ignore the error and write the error message to the standard output. Suppose we have a test script test.sh that outputs some content:
#!/bin/bash echo "Hello, World!" echo "This is a test file."
We can run test.sh and save the output to the file output.txt and display it on the screen:
./test. sh | tee output.txt
This way, the output of the script can be saved to a file without affecting the standard output.
In daily work, we often need to record logs in real time. Suppose we have a program program1.sh that outputs log information. We want to save the log information to the log.txt file and display it on the terminal in real time:
./program1.sh | tee -a log. txt
In this way, the output log information can be viewed at any time and retained in the file for subsequent viewing.
We can also use multiple tee commands in combination to achieve more complex output requirements. For example, save the output to two files at the same time and display it on the terminal in real time:
./program2.sh | tee file1.txt | tee file2.txt
In this way, the output information will Save it to file1.txt and file2.txt files at the same time, and display it on the terminal in real time.
Through the introduction of this article, we have learned about the basic syntax and common options of the Linux tee command, as well as practical application cases. The tee command can help us process the output of the command more flexibly. It can be saved to a file for viewing or displayed in real time on the terminal. In daily work, rational use of the tee command can improve production efficiency and facilitate our logging and output management. I hope that through the introduction of this article, readers can better master the usage of the Linux tee command, which will bring convenience to work and study.
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