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Last Updated 19 Feb, 21 In Unixlike operating systems, the chmod command is used to change the access mode of a file The name is an abbreviation of change mode SyntaxUse chmod to change the file permissions sudo chmod 600 /swapfile This removes all permissions from the file group members and others, but allows the file owner, root, to read and write to the file RELATED How to Use the chmod Command on Linux We need to use the swapon command to let Linux know there is a new swap file available to use WeThe Linux chmod command alsoThe Linux chmod command can be used to change the existing permissions on a file The below character references are used with chmod command to identify the Linux users/Linux groups/world (other Linux users) to whom the new permissions apply If no references are specified it defaults to "all" Reference Description Understanding Linux Permissions And Chmod Usage Linux chmod table