Ruby/File Directory/chmod

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м (1 версия: Импорт выборки материалов по Ruby)
 

Текущая версия на 17:57, 13 сентября 2010

Содержание

Change file mode to 0644

file = File.new( "books.txt", "w" ).chmod( 0644 )
system "ls -l books.txt"
File.delete( "books.txt" )



Change mode and use system command to check

file = File.new( "books.txt", "w" ).chmod( 0755 )
system "ls -l books.txt"



Changing File Modes and Owner

To change the mode (permissions or access list) of a file, use the chmod method with a mask
file = File.new( "books.txt", "w" )
file.chmod( 0755 )



Changing the Permissions on a File

class File
  U_R = 0400
  U_W = 0200
  U_X = 0100
  G_R = 0040
  G_W = 0020
  G_X = 0010
  O_R = 0004
  O_W = 0002
  O_X = 0001
  A_R = 0444
  A_W = 0222
  A_X = 0111
end
open("my_file", "w") {}
File.chmod(File::U_R | File::U_W | File::G_R | File::O_R, "my_file")
File.chmod(File::A_R | File::U_W, "my_file")
File.chmod(0644, "my_file")                   # Bitmap: 110001001



Give everyone access to everything

class File
  U_R = 0400
  U_W = 0200
  U_X = 0100
  G_R = 0040
  G_W = 0020
  G_X = 0010
  O_R = 0004
  O_W = 0002
  O_X = 0001
  A_R = 0444
  A_W = 0222
  A_X = 0111
end
 
new_permission = File.lstat("my_file").mode | File::A_R | File::A_W | File::A_X
File.chmod(new_permission, "my_file")



Masks for chmod

Mask    Description
0700    rwx mask for owner
0400    r for owner
0200    w for owner
0100    x for owner
0070    rwx mask for group
0040    r for group
0020    w for group
0010    x for group
0007    rwx mask for other
0004    r for other
0002    w for other
0001    x for other
4000    Set user ID on execution
2000    Set group ID on execution
1000    Save swapped text, even after use



Take away the world"s read access.

class File
  U_R = 0400
  U_W = 0200
  U_X = 0100
  G_R = 0040
  G_W = 0020
  G_X = 0010
  O_R = 0004
  O_W = 0002
  O_X = 0001
  A_R = 0444
  A_W = 0222
  A_X = 0111
end
 
new_permission = File.lstat("my_file").mode ^ File::O_R
File.chmod(new_permission, "my_file")



Take away the world"s write and execute access

class File
  U_R = 0400
  U_W = 0200
  U_X = 0100
  G_R = 0040
  G_W = 0020
  G_X = 0010
  O_R = 0004
  O_W = 0002
  O_X = 0001
  A_R = 0444
  A_W = 0222
  A_X = 0111
end
 
new_permission = File.lstat("my_file").mode ^ (File::O_W | File::O_X)
File.chmod(new_permission, "my_file")