Question

What chmod command would you use to impose the following permissions?

1. on a directory(called dir1) and all its subdirectories such that: the owner would have read, write, and execute; the group would have read and execute; and others would have read(write the command in two ways: using rwx and using numeric value)

2. on file (called file1)such that: the owner would have read and write; the group would have no permissions; and others would have write

(write the command in two ways: using rwx and using numeric value)

3. set the special permission SGID and sticky bit for dir1.(you don't need to change the defined permission in 1)

Starting from the Linux default permissions for file and directories, what umask command would you use to ensure that for all new:

4. directories, the owner would have read, write, and execute; members of the group would have read and execute; and others would have read

5. files, the owner would have read and execute; the group would have read, write, and execute; and others would have execute

Answer 1

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Pre-Step: Setting up the directory structure

1. chmod using rwx and numeric value for directory

2. chmod using rwx and numeric value for file

3a). chmod to set SGID

Notice the s in the output of ls -l in dir1's permissions

3b). chmod to set sticky bit

Notice the T at the end in dir1's permissions

4. Setting umask so that u=rwx,g=rx,o=r

We create dir3 to test if it worked

5. Set umask for files to have u=rx,g=rwx,o=x

Note: The base permissions set by umask for files is 666 (read, write for owner, group and others)

So files cannot be set to executable with umask (unlike directories)

The command below makes u=r,g=rw,o=