Numeric permissions - Revision history

Jimbo: Reverted edits by 213.61.157.93 (Talk); changed back to last version by Jimbo

2007-10-12T04:33:20Z

Reverted edits by 213.61.157.93 (Talk); changed back to last version by Jimbo

2007-06-20T04:41:54Z

2007-04-17T17:50:28Z

2004-09-13T05:18:43Z

Changing file permissions

2004-09-13T00:32:08Z

2004-09-12T21:38:36Z

Changing file permissions

2004-09-12T21:36:22Z

Changing file permissions

2004-09-12T21:33:40Z

Changing file permissions

2004-09-12T21:31:10Z

2004-09-12T21:25:20Z

Changing file permissions

@@ Line 39: / Line 39: @@
 2 1 4 2 1 4 2 1
 If you want to set the permission for a particular file to rwxr-x---, you just need to add the numbers up for each trio:
-  rwx == 4 2 1 == 7,
+  rwx == 4+2+1 == 7,
-  r-x == 4 0 1 == 5,
+  r-x == 4+0+1 == 5,
-  --- == 0 0 0 == 0.
+  --- == 0+0+0 == 0.
 So give the command
   #chmod 750 filename.xyz
@@ Line 48: / Line 48: @@
 . '''Defining permissions symbolically'''
-You'll want to tell [[chmod]] what to change the permissions to; for this you'll want to know that to [[chmod]], u == user, g == group, o == others and a == all, also that you can add and remove permisions with the =,   and - signs:
+You'll want to tell [[chmod]] what to change the permissions to; for this you'll want to know that to [[chmod]], u == user, g == group, o == others and a == all, also that you can add and remove permisions with the =, + and - signs:
   chmod u=rwx,g=rx filename.xyz
 tells [[chmod]] "give these values and these values only"
-  chmod ug rx filename.xyz
+  chmod ug+rx filename.xyz
 tells [[chmod]] "add r and x permissions to user and group for filename.xyz"
   chmod o-rwx filename.xyz

@@ Line 39: / Line 39: @@
 2 1 4 2 1 4 2 1
 If you want to set the permission for a particular file to rwxr-x---, you just need to add the numbers up for each trio:
-  rwx == 4+2+1 == 7,
+  rwx == 4 2 1 == 7,
-  r-x == 4+0+1 == 5,
+  r-x == 4 0 1 == 5,
-  --- == 0+0+0 == 0.
+  --- == 0 0 0 == 0.
 So give the command
   #chmod 750 filename.xyz
@@ Line 48: / Line 48: @@
 . '''Defining permissions symbolically'''
-You'll want to tell [[chmod]] what to change the permissions to; for this you'll want to know that to [[chmod]], u == user, g == group, o == others and a == all, also that you can add and remove permisions with the =, + and - signs:
+You'll want to tell [[chmod]] what to change the permissions to; for this you'll want to know that to [[chmod]], u == user, g == group, o == others and a == all, also that you can add and remove permisions with the =,   and - signs:
   chmod u=rwx,g=rx filename.xyz
 tells [[chmod]] "give these values and these values only"
-  chmod ug+rx filename.xyz
+  chmod ug rx filename.xyz
 tells [[chmod]] "add r and x permissions to user and group for filename.xyz"
   chmod o-rwx filename.xyz

@@ Line 22: / Line 22: @@
 To change permissions with [[chmod]], you'll need to know how to tell the shell what permissions you want changed. There are two ways to do this, and they're both equal, although once you get the hang of using the numbers, you'll find that it's much more absolute and hence easier to be sure that the permissions that you asked for are the only ones that you'll get.
-# '''Defining permissions numerically'''
+.  '''Defining permissions numerically'''
 There are two ways to learn this: by rote, or comprehensively.  If you just want a fast explanation of what the most commonly used numbers mean, it's like this:
@@ Line 47: / Line 47: @@
 -rwxr-x---
-# '''Defining permissions symbolically'''
+. '''Defining permissions symbolically'''
 You'll want to tell [[chmod]] what to change the permissions to; for this you'll want to know that to [[chmod]], u == user, g == group, o == others and a == all, also that you can add and remove permisions with the =, + and - signs:
   chmod u=rwx,g=rx filename.xyz

← Older revision		Revision as of 00:32, 13 September 2004
Line 56:		Line 56:
	tells [[chmod]] "remove rwx permissions from the others group" -- note that this is the same as		tells [[chmod]] "remove rwx permissions from the others group" -- note that this is the same as
	chmod o-a filename.xyz		chmod o-a filename.xyz
		+
		+	see also [[ACL]].
		+
		+	[[Category:FreeBSD Terminology]]

@@ Line 31: / Line 31: @@
 ... r-- ... read (read-only, NO execution allowed)
 ... --- ... (access denied)
 For the more comprehensive explanation, you'll need to know that the three permissions in a set (rwx) can be represented in binary as on or off, and you'll need to understand binary counting. This may help you a bit:

@@ Line 26: / Line 26: @@
 There are two ways to learn this: by rote, or comprehensively.  If you just want a fast explanation of what the most commonly used numbers mean, it's like this:
-means read/write/execute,
+... rwx ... read/write/execute (all permissions)
-means read/write,
+... rw- ... read/write (read/write, but do not execute)
-means read/execute,
+... r-x ... read/execute (read-only, execution allowed)
-means read-only,
+... r-- ... read (read-only, NO execution allowed)
-means access denied.
+... --- ... (access denied)
 For the more comprehensive explanation, you'll need to know that the three permissions in a set (rwx) can be represented in binary as on or off, and you'll need to understand binary counting. This may help you a bit:

@@ Line 28: / Line 28: @@
 means read/write,
 means read/execute,
-means write-only,
+means read-only,
 means write/execute,
-means read only,
+means write-only,
 means execute-only and
 means access denied.