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chmod is a Unix / Linux command that lets you tell the system how much (or little) access it should permit to a file. If value is 4, then read permission is given to the file. If value is 2, then write permission is given to the file. If value is 1, then execute permission is given to the file.
4-digit Chmod Calculator
Chmod Calculator is used to set permissions for files or folders. This calculator is under latest beta version and it provides a Multi platform compatible script. This script allows setting permission for superuser also.