Red Hat NETSCAPE MANAGEMENT SYSTEM 6.0 - CUSTOMIZATION User Manual download pdf (Page 270)

258 Managing Files and Directories

Tip: cron is a daemon. Daemons handle tasks in the background. To read the cron

man page, type man cron at the shell prompt.

So what happens if we:

Have more than one operating system on our machine, and switch between them – causing us

to halt and restart our Red Hat Linux system;

Shutdown and turn off our machine at the end of the day.

This might mean that cron never has a chance to update the locate database. No problem. We can

just update the database manually. Let’sgiveitatry.

First, su to root.

Now, at the shell prompt, type:

/etc/cron.daily/updatedb.cron

After a few minutes, the locate database will be current.

17.3 Command History and Tab Completion

It doesn’t take long before the thought of typing the same command over and over becomes unap-

pealing, at best.

Linux users don’t feel any differently about that, either. But in Linux, since you can string together

commands at the shell prompt, one minor typo in a couple lines of a command could mean that all

that typing was in vain.

So there’sasolution:It’s called command-line history. By scrolling with the up and down arrow keys,

we can ﬁnd plenty of our previously typed commands – including the ones with typos.

Let’s try it by taking a look again at sneakers.txt.Theﬁrst time, however, at the shell prompt,

we’ll type:

cat sneakrs.txt

Oops! Nothing happens, of course, because there is no sneakrs.txt ﬁle.Noproblem.We’ll just

use the up-arrow key to bring back the command, then use the left-arrow key to get to the point

where we missed the “e.” Insert the letter and press

Enter again.

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Red Hat NETSCAPE MANAGEMENT SYSTEM 6.0 - CUSTOMIZATION User Manual Page 270