November 2005
Beginner to intermediate
528 pages
24h 11m
English
Content preview from Mac OS X Tiger in a NutshellBecome 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,
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Name
launchd
Synopsis
launchd [-h | -d | -s | -v | -x | command]Introduced with Mac OS X Tiger (10.4), launchd is an automated process launcher, starting and stopping processes as needed. It’s intended as a catch-all replacement for init, /etc/rc and related scripts, SystemStarter, register_mach_bootstrap_servers, cron, loginwindow hooks run out of /etc/ttys, and watchdog (although it hasn’t yet displaced all of them). It is the first process started during the boot sequence, with a PID of 1.
Each job controlled by launchd is configured by an XML property list file located in either /System/Library/LaunchDaemons/ or /Library/LaunchDaemons/ (for system-wide daemon processes), or /System/Library/LaunchAgents/, /Library/LaunchAgents/, or ~/Library/LaunchAgents/ (for per-user processes).
launchd can be managed with the launchctl utility. Upon startup, it checks /etc/launchd.conf or ~/.launchd.conf for launchctl commands to execute, although the commands to load the daemon configuration files are currently located in /etc/rc.
Options
- -d
Causes launchd to run itself as a background process.
- -h
Prints a limited usage statement to standard output.
- -s
Boots the system in single-user mode. This flag is used when
-S is held down on startup.- -v
Boots the system in verbose mode. This flag is used when -V is held down on startup.
- -x
Boots the system in safe mode. This flag is used when Shift is held ...
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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.