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n a production environment, it is a good idea to know whether your applications are dumping core often. It is also considered good housekeeping to know about your core files so your hard disk won t fill up with unnecessary files. The small script in this chapter tracks down and cleans up core files. The script was intended to be run as an hourly cron job, although you could change the schedule to fit your needs. The job also has its priority lowered using the nice command so that it won t interfere with the performance of regular processes on the machine. The notifications I ve received from this script have characterized chronic issues with applications on more than one occasion. Without the script, I would have never seen the patterns. This script steps through each of the locally mounted file systems and finds all core files. It determines the applications that created the core files and moves the core files to a central location for later examination. The script also logs its actions and cleans up old saved files. First we have to set up some straightforward variables.

the same with the FastForward movie clip. This is, after all, a button that skips to the next song in the playlist, not a fast-forward button.

Imagine, for instance, that your page contains critical and dynamic information such as stock quotes or flight arrival information that needs to be updated on a regular basis. You can use the Timer control on your page to trigger updates to an UpdatePanel control, all without having to do any full-page refreshes.

3. Rename the VolumeSlider symbol to SeekKnob. Do the same with its containing folder,

4. Rename the Rewind symbol and its folder to Prev. 5. Complete your cleanup by renaming the VolumeBar symbol and its folder to SeekBar. 714

#!/bin/sh HOWOLD=30 FSLIST="/ /boot" UNAME=`uname -n` DATE=`date +%m%d%I%M` DATADIR="/usr/local/data/cores" LOGFILE="$DATADIR/cor_report"

1. Double-click the Play symbol to enter its timeline. Drag the playhead to frame 2, and you ll see

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To use a Timer control, you of course need a ScriptManager control on the page. You can add a Timer control to a page by dragging and dropping it onto the control surface. A good use for timers is to update the contents of an UpdatePanel control when the timer ticks. To see the Timer control in action, you can add an UpdatePanel control to a blank page along with a ScriptManager control. After you ve done this, you can drag and drop a Timer control onto the page. Also, place a Label control in the UpdatePanel. You can see what this looks like in the designer in Figure 5-12.

two vertical bars that represent pause, as shown in Figure 14-9.

The HOWOLD variable is used as the maximum age, in days, for saved core files. Any files older than this will be removed. The FSLIST variable contains the list of file systems that will be checked for core files. The list will vary from system to system. You could set FSLIST dynamically by using the df command to determine the locally mounted file systems. The command might look something like this: FSLIST=`df -l | grep '^/dev' | awk '{print $6}'`, which gathers the lines starting with /dev and then prints the field containing the file-system name. The other four variables contain the name of the system that the script is running on (UNAME), the current date (DATE), the directory to which the core files will be saved (DATADIR), and the name of the log file (LOGFILE).

Figure 14-9. Be sure to keep your mouse-related assets mouse-friendly. Granted, this symbol has been zoomed in quite a bit in the figure, but even at actual size, it s easy to see how the mouse can slip between the two bars, or accidentally miss the symbol altogether by slipping too far left or right. If this were a button symbol, the solution would be elementary: head to the Hit frame, and give the button a nice, sizable hit area. With movie clips, which don t have a Hit frame, you need to get creative. In this case, the solution happens in a layer named hit area.

play arrow icon, as shown in Figure 14-10. This rectangle is a simple shape, drawn with the Rectangle tool. The reason you can t see it until the shape is selected is because the shape s fill color is set to 0% Alpha. From a visual standpoint, it s imperceptible, but when the user hovers a mouse over this symbol, even the invisible shape provides a larger clickable surface area. Notice that the rectangle spans frames 1 and 2, so that it appears behind both the play and pause icons. This makes the hit area useful, regardless where this symbol s playhead appears.

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