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FilePermissions Understanding and Using File Permissions In Linux and Unix, everything is a file. Directories are files, files are files and devices are files. Devices are usually referred to as a node; however, they are still files. All of the files on a system have permissions that allow or prevent others from viewing, modifying or executing. To change or edit files that are owned by root, sudo must be used - please see RootSudo for details. If the owner read & execute bit are on, then the permissions are: -r-x------ There are three types of access restrictions: There are also three types of user restrictions: Note: The restriction type scope is not inheritable: the file owner will be unaffected by restrictions set for his group or everybody else. Folder/Directory Permissions Directories have directory permissions. read restricts or allows viewing the directories contents, i.e. ls command write restricts or allows creating new files or deleting files in the directory. Permissions in Action chmod with Letters
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Harvard University Library: Open Collections Program: Home Linux File Permissions Tutorial December 14, 2011By Roman Rafacz What we’ll cover in this article is how to identify permissions for files & directories and how to change them, as well as changing ownerships, groups, etc. Depending on what you want to do, you’ll want to make sure you have the appropriate permissions (obviously), so let’s find out how to change them. Let’s start by making a file we can use. I issued the “touch” command to make a file creatively named testfile. Touch will just create an empty file but has all the same attributes as an actual file. Commands: touch test file mkdir workfolder The permisions are broken into 4 sections. chmod – adds and removes permissions If you wanted to add or remove permissions to the user, use the command “chmod” with a “+” or “–“, along with the r (read), w (write), x (execute) attribute followed by the name of the directory or file. chmod +rwx “name of the file” chmod –rwx “name of the directory” chmod +x testfile – this would allow me to execute chmod g+w testfile Examples: 1 = –x