November 2017
Intermediate to advanced
1232 pages
36h 16m
English
book
A Practical Guide to Linux Commands, Editors, and Shell Programming, Fourth Edition
by Mark G. Sobell, Matthew Helmke
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join Joins lines from two files based on a common field
join [options] file1 file2
The join utility displays a single line for each pair of lines from file1 and file2 that have the same value in a common field called the join field. Both files must be sorted on the join field or join will not display the correct output.
Arguments
The join utility reads lines from file1 and file2 and, for each pair of lines, compares the specified join field from both lines. If you do not specify a join field, join takes the first field as the join field. If the join fields are the same, join copies the join field along with the rest of the lines from both files to standard output. You can specify a hyphen (–) in place of either filename (but not both) to cause ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.