November 2013
Intermediate to advanced
224 pages
6h 9m
English
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Understanding the Command Line: Options, Arguments, and Commands
To tell a command-line application how to do its work, you typically need to enter more than just the name of its executable. For example, we must tell grep which files we want it to search. The database backup app, db_backup.rb, that we introduced in the previous chapter needs a username and password and a database name in order to do its work. The primary way to give an app the information it needs is via options and arguments, as depicted in Figure 1, Basic parts of a command-line app invocation. Note that this format isn’t imposed by the operating system but is based on the GNU standard for command-line apps.[13] Before we learn how to make a command-line interface that can ...
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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.
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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.