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                         COMMAND                       

GO

  chmod

 SYNTAX

Absolute:   chmod  mode  filename

Relative:   chmod  [user]   +-    =   [permission]  filename

 SYNTAX

Absolute:   chmod  mode  filename

Relative:   chmod  [user]   +-    =   [permission]  filename

 FUNCTION

       chmod -  changes the access permission of a file or directory.

 NOTES:

       Only the owner or a superuser may change permissions!

       The user option above may be replaced with:

                        a   all users,

                        g   group, 

                        o   others, or 

                        u   user (owner).

        +  adds permission,  - removes permission.

       Permission is specified with  x ,  r  or  w , to mean

       execute, read or write.

 The octal representation for file permission is

 accepted as well, therefore the command :

 chmod  755  *   gives all permissions to

 the owner, and read and execute for the group and others.

  The command:              chmod  og-rw  * 

  takes away read and write privileges from the group

  and others for all the files in the directory.

  The command:              chmod  700  mydirectory

  removes access to the directory mydirectory from

  the group and others.   

  The command:              chmod  =  invoices

  will take away all permissions to the file called invoices.

 Let's look at the long listing of files in the

 current directory.

  Please type in the appropriate command.

 $PROMPT$

 That is correct!

 You've got it on the 2nd try.

 Good, you understand the concept.

 Please use the ls command with the -l option.

 Please type ls -l

 I guess I must type this for you:

 $PROMPT$

FORGET1

 Observe the result on the terminal!

 ls -l                                           

total 12

-rw-r--r--  1 demo     640 Nov 07 12:17 file1     

-rwxr--r--  1 demo     402 Nov 01 15:34 file2     

-rw-------  1 demo    1402 Nov 09 20:57 file3     

-rw-r-----  1 demo     749 Sep 27 16:43 file4     

-rwxr-xr-x  1 demo    2452 Nov 02 09:12 demofile1 

 $PROMPT$

 Type the command that will give the owner all permissions for all files

 in the directory while giving execute only permission to the group and 

 others.  Use octal notation to specify the absolute form of the command.

 $PROMPT$

 That is correct!

 You've got it on the 2nd try.

 Good, you understand the concept.

 Please use chmod with permission 711 for all files (*).

 Please type chmod 711 *

 I guess I must type this for you:

 $PROMPT$

FORGET2

 Observe the result on the terminal!

 chmod 711 *                                    

 $PROMPT$

 Now verify that the file permissions have indeed 

 been changed by using the appropriate command.

 That is correct!

 You've got it on the 2nd try.

 Good, you understand the concept.

 No, use ls with the -l option.

 Please type ls -l

 I guess I must type this for you:

 $PROMPT$

FORGET3

 ls -l                                          

 Observe the result on the terminal!

total 12

-rwx--x--x  1 demo     640 Nov 07 12:17 file1     

-rwx--x--x  1 demo     402 Nov 01 15:34 file2     

-rwx--x--x  1 demo    1402 Nov 09 20:57 file3     

-rwx--x--x  1 demo     749 Sep 27 16:43 file4     

-rwx--x--x  1 demo    2452 Nov 02 09:12 demofile1 

 $PROMPT$