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To use chmod, you need to know about access modesEach file on a Linux system has nine access modes (or settings) that determineThe chmod (short for change mode) command is used to manage file system access permissions on Unix and Unixlike systems There are three basic file chmod is Linux command used to change file permissionschmod changes user, group and other read, write and execute permissionchmod 755 is popular use case for chmod chmod 755 is generally used to make most of the operations without problem because it provides ease for system administrators while running applications chmod 755 755 can be separated as Linux Chmod Example Chmod 755