CHMOD(I) 2/8/75 CHMOD(I)





CHMOD(I)                     2/8/75                      CHMOD(I)







NAME

     chmod - change mode



SYNOPSIS

     chmod octal file ...



DESCRIPTION

     The octal mode replaces the mode of each of the files.   The

     mode is constructed from the OR of the following modes:



        4000    set user ID on execution

        2000    set group ID on execution

        1000    sticky bit for  shared,  pure-procedure  programs

               (see below)

        0400    read by owner

        0200    write by owner

        0100    execute (search in directory) by owner

        0070    read, write, execute (search) by group

        0007    read, write, execute (search) by others



     Only the owner of a file (or the super-user) may change  its

     mode.



     If an executable file is set up for sharing  (``-n''  option

     of  ld  (I)  ),  then  mode  1000  prevents  the system from

     abandoning the swap-space image of the program-text  portion

     of  the  file  when its last user terminates.  Thus when the

     next user of the file executes it, the text need not be read

     from  the  file  system but can simply be swapped in, saving

     time.  Ability to set this bit is restricted to  the  super-

     user  since swap space is consumed by the images; it is only

     worth while for heavily used commands.





SEE ALSO

     ls (I), chmod (II)



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