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introduction to web programming
Deleting, Renaming and Changing the Permissions of Files  
Perl also provides you with all of the file management functions typically offered by your operating system. In my experience, the three most utilized functions in CGI scripts are unlink, rename and chmod. unlink is Perl's function for deleting a file from the file system. The syntax is pretty straight forward.

     unlink ("[filename]");

This line of Perl code will delete the file called filename provided that the script has permissions to delete the file.

Your Perl script can also rename a file using the rename function:

     rename ("[old_filename]", "[new_filename]");

In this case, the file's name will be replaced with the new filename specified.

Finally, Perl gives you the ability to affect the permissions of files in the file system using the chmod function. The syntax is also fairly straight forward as follows:

     chmod (0666, "filename");

In this case, "filename" will be made readable and writable by user, group and world.

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