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join Command in Text Processing on Linux
join is a powerful text processing command in Linux. It lets you combine lines of two files on a common field, which works similar to the Join operation in SQL. It’s particularly useful when you’re dealing with large volumes of data. Specifically, join uses the lines from two files to form lines that contain pairs of lines related in a meaningful way.
For instance, if you have two files that have a list of items, one with costs and the other with quantities, you can use join to combine these two files so each item has a cost and quantity on the same line.
# Syntax
join file1.txt file2.txt
Please note that join command works properly only when the files are sorted. It’s crucial to understand all the provided options and flags to use join effectively in text processing tasks.