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and minus signs preceding the read, write, and execute permissions. If no category symbol is used, all categories are assumed, and the permissions specified are set for the user, group, and others. In the next example, the first chmod command sets the permissions for the group to read and write. The second chmod command sets permissions for other users to read. Notice no spaces are between the permission specifications and the category. The permissions list is simply one long phrase, with no spaces. $ chmod g+rw mydata $ chmod o+r mydata A user may remove permissions as well as add them. In the next example, the read permission is set for other users, but the write and execute permissions are removed: $ chmod o+r-wx mydata Another permission character exists, a, which represents all the categories. The a character is the default. In the next example, the two commands are equivalent. The read permission is explicitly set with the a character denoting all types of users: other, group, and user. $ chmod a+r mydata $ chmod +r mydata One of the most common permission operations is setting a file s executable permission. This is often done in the case of shell program files. The executable permission indicates a file contains executable instructions and can be directly run by the system. In the next example, the file lsc has its executable permission set and then executed: $ chmod u+x lsc $ lsc main.c lib.c $
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You can also set permissions on directories. The read permission set on a directory allows the list of files in
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a directory to be displayed. The execute permission enables a user to change to that directory. The write permission enables a user to create and remove his or her files in that directory. If you allow other users to have write permission on a directory, they can add their own files to it. When you create a directory, it is automatically given read, write, and execute permission for the owner. You may list the files in that directory, change to it, and create files in it. Like files, directories have sets of permissions for the owner, the group, and all other users. Often, you may want to allow other users to change to and list the files in one of your directories, but not let them add their own files to it. In this case, you would set read and execute permissions on the directory, but not write permission. This would allow other users to change to the directory and list the files in it, but not to create new files or to copy any of their files into it. The next example sets read and execute permission for the group for the thankyou directory, but removes the write permission. Members of the group may enter the thankyou directory and list the files there, but they may not create new ones. $ chmod g+rx-w letters/thankyou Just as with files, you can also use octal digits to set a directory permission. To set the same permissions as in the previous example, you would use the octal digits 750, which have the binary equivalents of 111 101 000. $ chmod 750 letters/thankyou
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The ls command with the -l option lists all files in a directory. To list only the information about the directory 2 itself, add a d modifier. In the next example, ls -ld displays information about the thankyou directory. Notice the first character in the permissions list is d, indicating it 2 is a directory. $ ls -ld thankyou drwxr-x--- 2 chris 512 Feb 10 04:30 thankyou
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