14
3
I have two files in a directory. One has correct permissions and the other has not. Is there a way I can "copy" the set of permissions from one file to another?
14
3
I have two files in a directory. One has correct permissions and the other has not. Is there a way I can "copy" the set of permissions from one file to another?
15
The GNU version of the chmod utility can copy the mode from one file (RFile
) to another (file
).
chmod --reference=RFile file
GNU coreutils is found in most Linux distributions and Cygwin, among other places. Not all chmod implementations provide this option.
1
I came up with this:
find $SOURCE -mindepth 1 -printf 'chmod --reference=%p\t%p\n'|sed "s/\t$SOURCE/ $DEST/g"|sh
It is not fully bullet proof, but does what I need.
0
try this:
find /PATH/TO/TARGET -exec chmod --reference /PATH/TO/SOURCE/{} {} \;
this would go up recursivly and chmod every file, if two directory don't match on files you will see lots of "No such file or directory" error.
find /home/myubuntuuser/Desktop/test1 -exec chmod --reference /home/myubuntuuser/Desktop/test2/{} {} \;
– Rick Sanchez – 2018-06-03T12:18:41.697
chmod: failed to get attributes of '/home/myubuntuuser/Desktop/test2//home/myubuntuuser/Desktop/test1': No such file or directory chmod: failed to get attributes of '/home/myubuntuuser/Desktop/test2//home/myubuntuuser/Desktop/test1/111.txt': No such file or directory chmod: failed to get attributes of '/home/myubuntuuser/Desktop/test2//home/myubuntuuser/Desktop/test1/222.txt': No such file or directory chmod: failed to get attributes of '/home/myubuntuuser/Desktop/test2//home/myubuntuuser/Desktop/test1/333.txt': No such file or directory – Rick Sanchez – 2018-06-03T12:18:49.070
tested it on 2 folders: test1 and test2. each have the same files 111/222/333.txt with different permissions. test1 has the default ones. test2 has 777 permissions. this is the error i get. – Rick Sanchez – 2018-06-03T12:19:49.993
0
You can use getfacl
to retrieve the full listing of file permissions, owner, group, and additional ACLs (access control lists).
$ getfacl filename.txt
# file: filename.txt
# owner: score
# group: score
user::rw-
group::---
other::---
If you save that output to a file (e.g. acl.txt
), you can then restore from this format with setfacl --restore acl.txt
. If you only want to restore a single file, and that file has a different filename to the original, you will want to use setfacl --set-file acl.txt filename.txt
(where filename.txt
is the new filename).
Save original permissions to acl.txt
:
$ getfacl filename.txt > acl.txt
Overwrite permissions (for demonstration; this is just so that you can see that restoring it in the next step works)
$ chmod 777 filename.txt
$ sudo chown nobody:root filename.txt
$ ls -l filename.txt
-rwxrwxrwx 1 nobody root 0 Jan 8 14:24 filename.txt
Use setfacl
to restore correct permissions from acl.txt
:
$ sudo setfacl --restore acl.txt
$ ls -l filename.txt
-rw------- 1 score score 0 Jan 8 14:24 filename.txt
The filename is taken from the # file:
comment generated by getfacl
, so there is no need to specify it on the command line.
If you want to restore those permissions to a different file, you can use --set-file
instead of --restore
like so:
$ setfacl --set-file acl.txt second_filename.txt
If you end up overwriting the permissions on some files in /usr
, but you don't know what files you have overwritten, you can usually fix it by restoring from another similarly configured system.
Backup permissions from working system (note: getfacl
generates relative paths, so ensure you cd
to a consistent location on both machines)
# cd /
# getfacl -R usr > /root/acls.txt
Copy the ACL dump to the system with broken permissions
$ scp root@working-system:/root/acls.txt .
$ scp acls.txt root@broken-system:/root/
Restore the ACL dump to overwrite the broken permissions with those from the known good machine
# cd /
# setfacl --restore /root/acls.txt
Hm... looks like this is supposed to work, but not supported on Mac OS X? There I only get illegal option... – Svish – 2010-02-28T16:18:08.810
2chmod is not a bash builtin command. it is a separate utility available on many unixes. the
--reference
option is included in the GNU version; OSX probably uses a chmod that originates with BSD instead. OSX man chmod : http://developer.apple.com/Mac/library/documentation/Darwin/Reference/ManPages/man1/chmod.1.html – quack quixote – 2010-02-28T16:31:20.993Svish, you might consider installing the GNU versions through MacPorts. – Jeremy L – 2010-03-01T23:31:55.313
Just figured that it would be useful to mention here that
cp -dpR <source-file> <dest-file>
will, when copying a file, copy permissions as well as the file.r – LawrenceC – 2011-03-14T13:57:36.143