When you perform the chmod 755 filename command you allow everyone to read and execute the file, and the file owner is allowed to write to the file as well. You may need this for Perl and other scripts that should to be run via a webserver. If you apply 755 to a directory, it means that everyone can go to it and get its file listing.
These permissions are usually translated into textual representation of rwxr-xr-x.
For more information see details on UNIX permissions and chmod command.
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