Edit files using the -i option. : Perl Command « Language Basics « Perl

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Perl » Language Basics » Perl Command

Edit files using the -i option.


  

#!/usr/local/bin/perl -i 



while ($line = <>) { 

    while ($line =~ s#\d+\s*[*+-/]\s*\d+(\s*[*+-/]\s*\d+)*#<x>#) { 

        eval ("\$result = $&;"); 

        $line =~ s/<x>/$result/; 

    } 

    print ($line); 

}

Related examples in the same category

1.	A program that uses the -0 option.
2.	A program that uses the -l option.
3.	The -c Switch checks the Perl syntax without actually executing the Perl commands
4.	The -e switch executes Perl statements at the command line instead of from a script.
5.	The -n Switch: print the contents of a file or search for a line that contains a particular pattern
6.	The -w option passed to the perl command generates a warning about the code itself.
7.	Using -e option to execute the perl statement
8.	Using /e modifier to evaluate
9.	Using the -n option.
10.	Using two statements with -e option
11.	Using variable with -e option
12.	'#!/usr/bin/perl -w ' tells the perl command to turn on extra warnings with the -w option.
13.	An example of the -a option.
14.	Perl can take its input from a file and send its output to a file using standard I/O redirection.
15.	Executing the Script

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