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This article mainly introduces how to use the fold command related knowledge, content detailed and easy to understand, simple and fast operation, has a certain reference value, I believe everyone read this fold command how to use the article will have a harvest, let's take a look at it.

The fold command is used to limit the file column width. It reads the contents from the specified file, adds additional characters to the columns exceeding the limit column width, and outputs them to the standard output device. If no file name is specified, or if the file name given is-, the fold command reads data from a standard input device.

fold command sample tutorial

The fold command is part of the GNU coreutils package, so we don't have to worry about installing it. Typical syntax for the fold command:

fold [OPTION]... [FILE]...

Allow me to show you some examples so you can better understand the fold command. I have a file called linux.txt, the contents are random. To wrap each line in the file above to the default width, run:

fold linux.txt

80 columns per row is the default width. Here is the output from the above command: As you can see in the output above, the fold command has limited the output to 80 characters wide. Of course, we can specify your preferred width, such as 50, as follows:

fold -w50 linux.txt

Example output: We can also write the output to a new file, as follows:

fold -w50 linux.txt > linux1.txt

The above command changes the linux.txt line width to 50 characters and writes the output to a new file called linux1.txt. Let's check the contents of the new file:

cat linux1.txt

Did you notice the output of the previous command? Some words are interrupted between lines. To solve this problem, we can use the-s flag to wrap at spaces. The following command adjusts each line in a given file to a width of 50 and wraps to a new line at spaces:

fold -w50 -s linux.txt

Did you get a good look? Now, the output is clear. The words in the new line are separated by spaces, and when the length of the word in the line is greater than 50, it will be adjusted to the next line. In all of the above examples, we use columns to limit the output width. However, we can use the-b option to force the width of the output to a specified number of bytes. The following command interrupts output with 20 bytes.

fold-b20 linux.txt About "fold command how to use" The content of this article is introduced here, thank you for reading! I believe everyone has a certain understanding of the knowledge of "how to use fold command." If you still want to learn more knowledge, please pay attention to the industry information channel.

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