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Often, the place where you want to position the warning light or strobe is totally remote from any source of power. Although we can often run things from batteries, sometimes we want to put a light where changing a battery would be undesirable. Solar energy, as well as producing clean renewable energy, also allows us to power things in remote places that would not easily be accessible using conventional cables, or where changing a battery could present a problem. In Figure 13-12 we see a commercially available solar waterproof warning light, there are many applications for this you might want to strap it to your back while cycling, for instance. The beacon has a couple of modes. When the beacon is set to off, the solar cell will charge the battery; however, the light will not flash under any circumstances. In solar mode, the beacon will charge during the day, and when the circuit senses a low lighting condition, the beacon will begin to flash using the power stored in the rechargeable battery. Set to on the beacon will flash regardless

" " " "

=\t", =\t", =\t", =\t",

$val1+$val2, $val1-$val2, $val1*$val2, $val1/$val2,

"\n"; "\n"; "\n"; "\n";

Once again, the results are as expected, with the result column being separated from the expression by a tab character:

$ ./operators.pl 10 + 20 = 30 10 - 20 = -10 10 * 20 = 200 10 / 20 = 0.5

Other escape characters commonly used in PERL include the following:

There are many applications where it is useful to have some sort of warning light, strobe, or beacon.

\a \b \f \r \\ \"

Terminal bell Backspace Form feed Return Inserts \ as a character literal Inserts " as a character literal

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In many cases, applications require that some kind of decision be taken on the basis of the current value of a specific variable. One way of making this decision is to use an if/else construct, which separates two blocks of code, one that is executed if a statement is true, and one that is executed if a statement is false. For example, imagine that you want to test whether a particular file exists. There are many reasons why you would want to do this. If a password file does not exist, for example, you might want to notify

Part II:

the system administrator, or if a shadowed password file does not exist, you might want to suggest that one be created for improved security. You can perform a file test by creating an expression using the e operator, which tests for existence. Thus, an expression like this,

(-e /etc/passwd)

of whether it is light or dark however, bear in mind that this will drain the battery. If you are going to use this beacon outside all of the time, you might want to think about how you can protect the circuit (Figure 13-13) against the ingress of water and solid matter. Most suppliers of cases sell a range of decent waterproof cases that are eminently suitable for outdoor use, or you may find that you can improvise with a Tupperware or similar container to produce a satisfactory housing.

when evaluated, returns true if the file /etc/passwd exists, and returns false if the file does not exist. Other file operators used in PERL include the following:

Tests whether the file contains binary data Tests whether the file is a directory entry Tests whether the file contains text data Tests whether the file is writeable

To test for the existence of both the password file and the shadowed password file, you can create a program like this:

#!/usr/bin/perl $passwdfile="/etc/passwd"; $shadowfile="/etc/shadow"; if (-e $passwdfile) { print "Found standard Solaris password file\n"; } else { print "No standard Solaris password file found\n"; } if (-e $shadowfile) { print "Found shadow password file - good security move!\n"; } else { print "No shadow password file found!\n"; }

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