How to cut files in linux

How to cut files in Linux: 1. Use the split command to cut a large file into multiple smaller files. The syntax is "split [option] file name [prefix]"; 2. Use the dd command , a tool for converting and copying files, and can also be used to cut files, the syntax is "dd if=file name of=output file name bs=block size count=number of blocks"; 3. Use the csplit command for regular expressions Tool syntax "csplit[options]filenamepattern" that matches a pattern to split a file into multiple files.

#The operating environment of this article: linux6.4.3 system, Dell G3 computer.

In Linux systems, different methods can be used to cut files. The following are several commonly used methods:

1. Use the split command:

The split command is a commonly used tool for cutting files. It can cut a large file into multiple smaller files. The basic syntax for using this command is as follows:

split [选项] 文件名 [前缀]

option can be one of the following:

-b: Specify the size of each cutting file, for example, "-b 1M" indicates the size of each file Size is 1MB.

-l: Specify the number of lines for each cut file, for example, "-l 100" means each file has 100 lines.

The prefix is ​​optional, it is used to name the cutting file, the default is "x".

For example, to cut a file named "file.txt" into cut files with 100 lines per file, you can use the following command:

split -l 100 file.txt

This will generate multiple files ending with " Files named "xaa", "xab", etc., each file contains 100 lines.

2. Use the dd command:

The dd command is a tool used to convert and copy files, and can also be used to cut files. The basic syntax for using this command is as follows:

dd if=文件名 of=输出文件名 bs=块大小 count=块数

The if parameter specifies the input file name, the of parameter specifies the output file name, the bs parameter specifies the size of each block, and the count parameter specifies the number of blocks to be copied.

For example, to cut a file named "file.txt" into cut files of 1MB each, you can use the following command:

dd if=file.txt of=output bs=1M count=1

This will generate a file named "output ” file containing the first 1MB of data from the input file.

3. Use the csplit command:

The csplit command is a tool used to cut a file into multiple files based on a regular expression matching pattern. The basic syntax for using this command is as follows:

csplit [选项] 文件名 模式

option can be one of the following:

-b: Specifies the naming pattern for the output file.

-f: Specify the prefix of the output file.

A pattern is a regular expression used to match content in a file.

For example, to cut a file named "file.txt" into multiple files with "output" as the prefix and each file with "pattern" as the delimiter, you can use the following command:

csplit -b output -f pattern file.txt '/pattern/'

This will generate multiple files named "output00", "output01", etc., each containing a section separated by "pattern".

The above are several common methods for cutting files in Linux systems. Depending on the needs and actual situation, you can choose one of the methods to cut the file.

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