vault backup: 2023-03-28 15:06:29

content/notes/10-scheduled-tasks-and-logs.md

@@ -0,0 +1,37 @@
+---
+title: "10-scheduled-tasks-and-logs"
+tags: 
+- lecture
+- cosc301
+---
+
+Daemon 
+- A process that runs in the background and is independent of control from all terminals 
+- Reasons for daemons’ independence of terminals 
+	- Prevent daemons’ error message from appearing on a user’s terminal 
+	- Signals generated from terminal keys must not affect any daemons that were started from that terminal earlier 
+- Typical daemons 
+	- crond, syslogd
+
+Daemonization
+```
+if( (pid = fork()) != 0) exit(0); //parent terminates 
+setsid(); // become session leader 
+signal(SIGHUP, SIG_IGN); if( (pid = fork()) != 0) exit(0); //new child continues 
+//now it becomes daemon
+```
+
+The purpose is to make the process independent of the control from any terminals.
+
+> [!INFO] when you are independent from 
+
+Scheduled tasks 
+- Automating tasks 
+	- crond and crontab 
+	- crond is a very important daemon for automatically executing tasks 
+	- Tasks can be configured to repeat hourly, daily, weekly,…, or even per minute. 
+- Possible uses 
+	- Clean file systems 
+	- Log rotate 
+	- Check log files 
+	- Monitor system status and resources

content/notes/cosc-301.md

@@ -39,6 +39,7 @@ https://www.cs.otago.ac.nz/cosc301/schedule.php
 - [x] [[07-system-installation]]
 - [ ] [[08-post-installation]]
 - [ ] [[09-wireless-networking]]
+- [ ] [[10-scheduled-tasks-and-logs]]
 
 
 # Info