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Дата изменения: Fri Jan 17 12:43:25 1997 Дата индексирования: Tue Oct 2 02:35:48 2012 Кодировка: Поисковые слова: http www.astronet.ru |
There is a shorthand way of setting permissions by using octal numbers. Read permission is given the value 4, write permission the value 2 and execute permission 1.
r w x 4 2 1
These values are added together for any one user category:
1 = execute only 2 = write only 3 = write and execute (1+2) 4 = read only 5 = read and execute (4+1) 6 = read and write (4+2) 7 = read and write and execute (4+2+1)
So access permissions can be expressed as three digits. For example:
user group others chmod 640 file1 rw- r-- --- chmod 754 file1 rwx r-x r-- chmod 664 file1 rw- rw- r--