![]() Identifying current group and others - idįiles or directories that you create or edit become associated with your current UNIX group. To share with colleagues who do not have NCAR user accounts, see Sharing data and making unattended transfers. ![]() Consider using the setfacl command to set up an access control list.If there is no group that allows you to share as needed with other users who have NCAR user accounts: You can use the commands described below to set or change group ownership of certain files and directories so only members of that UNIX group have permission to access them. You should have a UNIX group that corresponds to your project code – such as group uabc0001 for project code UABC0001. Say you don't want all members of the ncar group to have group permissions to read, write, and execute certain files. For example, you can limit access to users who share your core-hour or storage space allocation. Several additional commands are useful for managing groups to control who can access files and directories. The other nine flags, in groups of three, indicate: The first flag indicates, for most directory contents, that what is listed is a file (-) or a directory (d). The first column is a string of 10 permission flags. To see who can work with your files and directories, log in and look at the output of an ls ‑l command. It is useful in the case of handling directory trees recursively. The X permission allows execution only if the target is a directory or if the execute permission has already been set for the user or group. When setting permissions, the execute flag can be set to upper-case X, which differs from the lower-case x setting. An alternative to changing permissions recursively is to set them selectively as shown in this example below.However, if you change directory permissions recursively (see chmod below), you are changing them for all of the files and subdirectories in that directory tree. Subdirectories can have less restrictive permissions than their parent directories.Users who have write permission for a directory can delete files in the directory without having write permission for those files.Three additional things to note regarding directory permissions: For example, you can give a user read permission for a file, but the user won't have access to it without also having permission to traverse the directory tree that contains the file. Carefully consider both the file permissions and the directory permissions to get the desired end result. Changing group ownership of a file or directory - chgrpįiles in a UNIX system have associated permissions that determine who can read (r), write (w), and execute (x) them.ĭirectory permissions use those same flags to indicate who can list files in a directory (r), create and remove files in the directory (w), or cd into or traverse (x) the directory.Identifying current group and others - id.Changing default permissions with umask.
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