join command in Linux with Examples

Introduction

join command in Linux means Join lines of two files on a common field. In the Linux operating system, processing and merging text files are common tasks that are essential for effective data management and manipulation.

The join command is a powerful tool that allows users to combine lines of two files based on a common field. This command is particularly useful for merging data sets and performing relational database-like operations on text files. In this article, we will explore the join command in detail, learn how to use it, and provide practical examples that demonstrate its capabilities in real-world scenarios.

join command in Linux with Examples

Syntax

join [OPTION]… FILE1 FILE2

According to the man page, the join command merges lines of two files based on a common field. For more detailed information about the join command, you can use:

man join

join command in Linux with Examples

To join two files on the first field by default, use:

$ join huuphan.txt devopsroles.txt

To join files on a specific field, use the -1 and -2 options to specify the field numbers in the first and second files, respectively:

join -1 2 -2 3 file1.txt file2.txt

To include lines from both files that do not have a matching join field, use the -a option:

join -a 1 -a 2 file1.txt file2.txt

To change the output field separator, use the -t option:

join -t ',' file1.csv file2.csv

To suppress the output of unpaired fields, use the -o option:

join -o 1.1 1.2 2.3 file1.txt file2.txt

To perform a case-insensitive join, use the -i option:

join -i file1.txt file2.txt

Conclusion

join command is a simple command in Linux.The join command is a versatile and powerful tool in Linux for merging lines of text files based on a common field. By mastering its options and syntax, you can enhance your data processing skills and streamline your file management tasks.

Hopefully, this article has provided you with a clearer understanding of how to use the join command examples effectively and apply it in your daily activities. Keep exploring and leveraging the powerful commands in Linux to improve your efficiency and productivity in managing data and automating tasks. Thank you for reading the DevopsRoles page!

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About HuuPV

My name is Huu. I love technology and especially Devops Skill such as Docker, vagrant, git so forth. I likes open-sources. so I created DevopsRoles.com site to share the knowledge that I have learned. My Job: IT system administrator. Hobbies: summoners war game, gossip.
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