find files that has write permission

babu198649 · 11-23-2008, 06:22 AM

Hi
i want to find the files which have write permission.To use the -perm switch of the find command i should know all the modes of the file.

But i want to list files that have write permission(other modes are not considered). How to write this command.

Thank you

BlueC · 11-23-2008, 08:48 AM

How about...

Code:

find . -perm /200

AFAIK that should return all files that have write permissions by the owner.

These are two different ways to achieve the same thing:

Code:

find . -perm /u+w
find . -perm /u=w

babu198649 · 11-23-2008, 11:42 PM

I get error
/home/mrpg:$ find . -perm /200
find: invalid mode `/200'

/home/mrpg:$ find . -perm /u=w
find: invalid mode `/u=w'

billymayday · 11-23-2008, 11:51 PM

That works for me. What distro are you using? What version of find? What is the filesystem?

babu198649 · 11-24-2008, 12:10 AM

What distro are you using?
RHEL4

What version of find?
/home/mrpg:$ find -version
GNU find version 4.1.20

What is the filesystem?
/home/mrpg:$ df -Th
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
ext3 27G 21G 4.1G 84% /
/dev/sda3 ext3 99M 13M 82M 14% /boot
none tmpfs 502M 0 502M 0% /dev/shm

billymayday · 11-24-2008, 12:20 AM

That is strange. I can copy and paste those usages and they work.

My find is only 4.2.27, so not that much later.

Just check you man page that yours supports that syntax.

linuxlover.chaitanya · 11-24-2008, 12:23 AM

With the same version of RHEL and find the following works for me:

find . -perm 200

linuxlover.chaitanya · 11-24-2008, 12:26 AM

But the ubuntu desktop supports the command 'as it is'.
This could be due the old find. The new find supports -perm using / but the older does not.

billymayday · 11-24-2008, 12:28 AM

I thought that could be the case - hence my man page suggestion. But try

Code:

find . -perm +u=w

Code:

       -perm +mode
              Deprecated,  old  way of searching for files with any of the permission bits in mode set.  You
              should use -perm /mode instead. Trying to use the '+' syntax with symbolic  modes  will  yield
              surprising  results.   For example, '+u+x' is a valid symbolic mode (equivalent to +u,+x, i.e.
              0111) and will therefore not be evaluated as -perm +mode but instead as the exact mode  speci-
              fier  -perm mode and so it matches files with exact permissions 0111 instead of files with any
              execute bit set.  If you found this paragraph confusing, you're not alone  -  just  use  -perm
              /mode.  This form of the -perm test is deprecated because the POSIX specification requires the
              interpretation of a leading '+' as being part of a symbolic mode, and so we switched to  using
              '/' instead.

babu198649 · 11-24-2008, 12:30 AM

hi
The man page of find says

-perm mode
File’s permission bits are exactly mode (octal or symbolic).
Symbolic modes use mode 0 as a point of departure.

There is no information about the "/" .Is it possible for me to list the files with write permissions.

billymayday · 11-24-2008, 12:32 AM

Sorry - was adding to my post above while you posted. See above.

babu198649 · 11-24-2008, 12:43 AM

Thanks billymayday,

I get the following output when my pwd is /tmp folder

/home/mrpg:$ find . -perm +u=w
.
./keyring-1fRJXf
find: ./keyring-1fRJXf: Permission denied
./hci.active.proc.6775

I dont want to list the files that i dont have Permission.But still i get Permission denied message .How to list only files which i have write Permission.

billymayday · 11-24-2008, 01:15 AM

That's an error message, so you could use

Code:

find . -perm +u=w 2>&1

babu198649 · 11-24-2008, 01:38 AM

I get error messages

/home/mrpg:$ find . -perm +u=w 2>&1
.
./keyring-1fRJXf
find: ./keyring-1fRJXf: Permission denied
./hci.active.proc.6775

billymayday · 11-24-2008, 01:44 AM

Changed

Try

find . -perm +u=w 2>/dev/null