June 2017
Beginner
502 pages
11h 26m
English
Content preview from Mastering Bash
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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.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.
DEMO
So, how could we turn one of our scripts into a daemon? One first attempt could be using &. The trailing ampersand is a Bash built-in which instructs the shell to run the command in the background inside a subshell. Once the command is executed, the shell does not wait for it to finish but returns a code 0, which means successful, and proceeds further in any other commands that are to be executed:
zarrelli:~$ ls -lah & ps -jf[1] 13704total 48Kdrwxr-xr-x 4 zarrelli zarrelli 4.0K Apr 12 14:12 .drwxr-xr-x 4 zarrelli zarrelli 4.0K Apr 12 19:37 ..-rw-r--r-- 1 zarrelli zarrelli 11 Apr 10 09:20 controller-rwxr--r-- 1 zarrelli zarrelli 121 Apr 11 18:30 coproc.sh-rwxr--r-- 1 zarrelli zarrelli 961 Apr 11 12:19 environment.sh-rwxr--r-- 1 zarrelli ...
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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.