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If you want to display the name of the symbolic link, you can access it in the cwd variable. The cwd variable is a special system variable that holds the name of a directory's symbolic link, if one exists. Variables such as cwd are discussed in 13. You display the contents of cwd with the command echo $cwd.
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File and Directory Permissions: chmod
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Each file and directory in Linux contains a set of permissions that determine who can access them and how. You set these permissions to limit access in one of three ways: You can restrict access to yourself alone, you can allow users in a predesignated group to have access, or you can permit anyone on your system to have access; and, you can control how a given file or directory is accessed. A file and directory may have read, write, and execute permissions. When a file is created, it is automatically given read and write permissions for the owner, enabling you to display and modify the file. You may change these permissions to any combination you want. A file could have read-only permission, preventing any modifications. A file could also have execute permission, allowing it to be executed as a program. Three different categories of users can have access to a file or directory: the owner, the group, or others. The owner is the user who created the file. Any file you create, you own. You can also permit your group to have access to a file. Often, users are collected into groups. For example, all the users for a given class or project could be formed into a group by the system administrator. A user can give access to a file to other members of the group. Finally, you can also open up access to a file to all other users on the system. In this case, every user on your system could have access to one of your files or directories. In this sense, every other user on the system makes up the "others" category. Each category has its own set of read, write, and execute permissions. The first set controls the user's own access to his or her files-the owner access. The second set controls the access of the group to a user's files. The third set controls the access of all other users to the user's files. The three sets of read, write, and execute permissions for the three categories-owner, group, and other-make a total of nine types of permissions. As you saw in the previous section, the ls command with the -l option displays detailed information about the file, including the permissions. In the next example, the first set of characters on the left is a list of the permissions set for the mydata file:
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$ ls -l mydata -rw-r--r-- 1 chris weather 207 Feb 20 11:55 mydata
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An empty permission is represented by a dash, -. The read permission is represented by r, write by w, and execute by x. Notice there are ten positions. The first character indicates the
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file type. In a general sense, a directory can be considered a type of file. If the first character is a dash, a file is being listed. If it is d, information about a directory is being displayed. The next nine characters are arranged according to the different user categories. The first set of three characters is the owner's set of permissions for the file. The second set of three characters is the group's set of permissions for the file. The last set of three characters is the other users' set of permissions for the file. In Figure 12-5, the mydata file has the read and write permissions set for the owner category, the read permission only set for the group category, and the read permission set for the other users category. This means, although anyone in the group or any other user on the system can read the file, only the owner can modify it.
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Figure 12-5: File permissions You use the chmod command to change different permission configurations. chmod takes two lists as its arguments: permission changes and filenames. You can specify the list of permissions in two different ways. One way uses permission symbols and is referred to as the symbolic method. The other uses what is known as a "binary mask" and is referred to as either the absolute or the relative method. Of the two, the symbolic method is the more intuitive and will be presented first. Table 12-7 lists options for the chmod command. Table 12-7: File and Directory Permission Operations Command or Option Execution chmod Options >+ >>= >r Adds a permission. Removes a permission. Assigns entire set of permissions. Sets read permission for a file or directory. A file can be displayed or printed. A directory can have the list of its files displayed. Sets write permission for a file or directory. A file can be edited or erased. A directory can be removed. Sets execute permission for a file or directory. If the file is a shell script, it can be executed as a program. A directory can be changed to and entered. Sets permissions for the user who created and owns the file or Changes the permission of a file or directory.
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