What is the usage of the Cat command under Linux

This article introduces the knowledge of "what is the use of the Cat command under Linux". Many people will encounter this dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

The Linux Cat command is very convenient for reading short files, and it is convenient to use the page command if a file is very large. Let's take a look at the actual application of the Linux Cat command.

Usage of the Linux Cat command: view the file with the cat command: $cat test.php

$cat-n test.php: add the line number when viewing

The Linux Cat command can also use the wildcard character: $cat-n * .php to display all php files (in sequence)

You can also put it this way: the $cat-n test.php test1.php test2.php; result is exactly the same as the wildcard output.

You can merge files with the Linux Cat command and the redirect operator (>):

$cat * .php > test3.php

If you have two files, test.php and test1.php, how do you merge them? You can use the redirect operator (> >)

$cat test.php > > test1.php, so merge test.php after test1.php. Pay attention to the order when merging, and you can't make a mistake.

You can use the cat command to create a new file and enter the contents directly into the file through the keyboard.

$cat > myfile.php

Use ctrl+d to save and exit the file when the input is complete

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