What is the purpose of the $match variable?

Refer to the PERL script shown in Figures 8.1 and 8.2.

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C:\Users ex h\Documents\Book SearchForTerms.prl - Notepad++ File Edit Search View Encoding Language Settings Macro Run Plugins Window? *O 510 SearchForTerms pr 13 #Sample program to scan file for a list of matching terms; #write records with matches to an output file for later import to a database 2 3 6 7 8 9 10 11 12 13 14 15 16 # 28 29 30 31 32 use TIME::Local; #open the file containing a list of terms of interest and load #them into an array; offset for first row = 0 $infile="mysearchterms.txt"; open (IN, Sinfile) or die "Couldn't open input file $infile "; Sterma= 0; while ($input = ) ( chomp (Sinput); $searchterms [Si] $input; $nterms++; } close (IN); $set a flag for first output record Smatch="n"; 17 18 #identify the file to be searched 19 $infile="SystemLog.txt"; 20 #identify the output file for records that match search terms 21 Soutfile="Output/SystemLogMatches.txt"; 22 #open and process the input file 23 open (IN, Sinfile) or die "Can't open input file $input "; 24 $num=0; 25 while ($input = ) [ 26 chomp (Sinput); 27 #this sample file contains non-printable characters; remove them $inputs/[\x7E-\xFF]//g; $num++; for ($i=0; $i < $nterms; $i++) { if ($input = /Ssearchterms [Si]/) ( #found a match Norm length: 1,381 lines: 47 Ln: 1 Col: 59 Sel: 010 Windows (CRLF) UTF-8 0 FIGURE 8.1 First part of script to search file based on search terms. X INS