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day 
of month
) to 
1
, which is the same as February 1st, March 1st, and so on. This job will 
be run if it's the first day of the month, but only if the current time is also 01:00 a.m., 
since we filled in the first 
and second column, which represent the minute and hour, 
respectively.
Once you finish editing a user's 
crontab
 and save it, 
cron
 is updated and, from 
that point forward, will execute the task at the time you select. The 
crontab
 will 
be executed according to the current time and date on your server, so you want to 
make sure that that is correct as well, otherwise you'll have your jobs execute at 
unexpected times. You can view the current date and time on your server by simply 
issuing the 
date
 command.
To get the hang of creating jobs with 
cron
, the best way (as always) is to practice. 
The second example 
cron
 job is probably a good one to experiment with, as updating 
your repository index isn't going to hurt anything.
Summary
In this chapter, we learned how to manage processes. We began with a look at the 
ps
 
command, which we can use to view a list of processes that are currently running. 
We also took a look at managing jobs, as well as killing processes that, for one reason 
or another, are misbehaving. We also discussed methods of changing the priority 
of a process, to ensure we have full control over which processes are given more 
processing time, and we also learned how we can schedule things to run at a later 
time and date with cron.
In 
Chapter 8
, 
Monitoring System Resources
, we'll take a look at some ways we can keep 
an eye on the resources that are available on our server, where we will learn how to 
check disk usage, understand memory usage and swap space, as well as a look at 
some utilities that can make resource management a breeze.

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Chapter 7