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Solar-powered path lights (Figure 13-14) are becoming ubiquitous in just about every garden center nowadays! There are lots of advantages to using solar power rather than a hard-wired system. First of all, as a hard-wired system is exposed to the elements, you need to ensure that you use low-voltage fixtures and fittings, which require a transformer to step down the voltage, or failing that, really expensive mains fixtures and fittings. Then the next thing to consider is that even the safest low-voltage system is still vulnerable to the gardener s spade a badly placed spade can mean disconnection of your garden lighting system. Solar-powered garden lights have none of these disadvantages. They charge their batteries during the day, and then at night as the light fades, they switch on, providing illumination. The change in illumination is detected by a CdS photocell. We will be using LEDs for this project (Figure 13-15) as they provide good efficiency a decent amount of illumination for the relatively small amount of energy we are able to provide.

#!/usr/bin/perl print "Content-type: text/html\n\n"; @shells=("/bin/sh", "/bin/csh", "/bin/sh", "/bin/tcsh", "/bin/zsh"); foreach $i (@shells) { if (-e $i && -x $i && -r $i && -s $i) { print "<b>Valid shell:</b> ".$i."<br>\n"; } else

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{ print "<b>Invalid shell:</b> ".$i."<br>\n"; } }

The standard options for sed are shown here:

Prevents display of pattern space Executes the script contained in the file filename Displays the version number

The standard POSIX options for awk are shown here:

14

Where filename is the name of the awk file to process Where field is the field separator Where x a variable, and y is a value Turns on lint checking Uses old-style lint checking Enforces traditional usage Displays the version number

Summary

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In this chapter, we have examined basic text editing and command-line processing, as well as more advanced text-processing utilities like sed and awk. As predecessors to PERL, sed and awk were widely used within shell scripts (see next chapter) to perform pattern analysis and matching.

Graphical user interfaces (GUIs) are an increasingly popular metaphor for interacting with computer systems, including the GNOME GUI included with Solaris 10. However, character user interfaces (CUIs) are a core feature of Solaris 10, because they provide a programmatic environment in which commands can be executed. Many operations on Solaris systems are performed in the context of a script, whether starting services at boot time or processing text to produce a report. Indeed, one of the key advantages of UNIX and UNIX-like environments over non-UNIX systems is the capability to combine large numbers of small commands in a CUI, in conjunction with pipes and filters, to create complex command sets that perform repetitive tasks that can be scheduled to run at a specific time.

The following key concepts are required knowledge for understanding shells, scripts, and the scheduling of operations.

All shells have a command prompt the prompt usually tells the user which shell is currently being used, the user who owns the shell, and the current working directory. For example, the following prompt

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