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                         COMMAND                       

GO

  chmod

 SYNTAX

       chmod  mode  file  ... 

       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!

       user may be a (all users), g (group),

       o (others), or u (owner).

       + adds file permission, - removes permission.

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

       execute, read and write.

 The octal representation for file permission is accepted as well, 

 therefore a command:  chmod 755 *  - gives all permissions to

 the OWNER, and read and execute for the GROUP and OTHERS.

  The command:       chmod  =  invoices

  will take away all permissions to the file invoices.

  The command:       chmod  og-rw  *

  takes away read and write privileges from the group

  and all others for all of the files in the directory.

  The command        chmod  700  mydirectory

  removes/locks away the file/directory mydirectory

  from the group and others.  Where 700 is the

  octal representation of file permissions, as discussed

  in the Lesson dealing with the UNIX file system.

Long directory listing practice - 1.8.3.0.6

 Let us see the long listing of files in the

 current directory:

  Please type in: ls -l:

 $PROMPT$

 That is correct!

 You've got it on the 2nd try.

 Good, you understand the concept.

 Please type ls -l 

 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

 $PROMPT$

Changing file permissions practice, - 1.8.3.0.7

 Let us give the owner all permissions, while

 giving execute permission only to the group and others for

 all files.  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 chmod with protection 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 *                                    

 $PROMPT$                                       

Change in ownership verification practice, - 1.8.3.0.8

 Now verify that indeed the file permissions

 have indeed been changed by typing:  ls -l

 That is correct!

 You've got it on the 2nd try.

 Good, you understand the concept.

 Please type ls -l 

 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 klm     640 Nov 07 12:17 file1

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

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

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

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

 $PROMPT$