July 2007
Beginner
347 pages
4h 40m
English
Content preview from CLI for Noobies: A Primer on the Linux Command LineBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
Chapter 13. Test This Command
The test command allows you to conditionally perform some task based on the existence, type, or status of a file. It also lets you do the same thing by comparing integer and string values. For my sake, we’ll keep it as simple as possible and stick to file tests while still showing off some of its potential.
You’ve Got Mail, or Do You?
OK. You’re not using AOL, but you want to know when you get mail. We can check for mail with the test command. Granted, a beep is not quite as nice as a human voice announcement, but it’s fine for our purposes.
The command below tests for the existence of /var/mail/username (that’s what the -e argument does) AND sounds a beep if it is found. At least it does if the beep program is installed ...
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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.