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This article mainly introduces the relevant knowledge of how to use the expand command, the content is detailed and easy to understand, the operation is simple and fast, and has a certain reference value. I believe you will gain something after reading this expand command article. Let's take a look at it.

The expand command converts the tabs (TAB) of the file to white space characters (space) and displays the results to the standard output device.

1. Brief introduction to Command

Used to convert the tabs (Tab) of the file to spaces (Space). By default, one Tab corresponds to eight spaces, and the result is output to standard output. If no file name is specified or given a file name of -, expand reads data from standard input.

The opposite command is unexpand, which converts spaces to Tab characters.

two。 The command format is expand [OPTIONS] [FILES] 3. The option description-I,-- initial does not convert the tab-t after non-blank characters,-- tabs=NUMBER specifies how many spaces a tab should replace instead of the default 8murt,-- tabs=LIST refers to the list of custom tab locations, separated by commas-- help displays help information-- version outputs version information 4. Common examples

(1) replace the first Tab character on each line in the file with 6 space characters, and the tabs after non-white space characters are not converted.

Expand-I-t 6 FILE

Contents of the original file:

The contents after the conversion are as follows:

5. common problem

(1) not all Tab will be converted to the default or specified number of space characters. Expand will replace Tab characters with an appropriate number of space characters based on the principle of alignment, and the principle of replacement is to make the following non-Tab characters on a physical Tab boundary (that is, an integer multiple of Tab size). For example, the following file:

Where CR and LF are carriage returns and newline characters under Windows, respectively. The result of conversion using the following command is shown below:

Expand-t 4 file

You can see that the second Tab character of the first line and all the Tab characters of the second line are not replaced with four space characters, or are replaced with the appropriate number of space characters in the alignment format of the original content.

This is the end of the article on "how to use the expand command". Thank you for reading! I believe you all have a certain understanding of the knowledge of "how to use expand commands". If you want to learn more, you are welcome to follow the industry information channel.

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