Recursively list files with no read acess

[neilc1976]

Hi There

I have sucessfully written some PHP scripts that recursively traverse the file system checking for all image files (jpg or gif) that do not have read permissions.

Now I would like to know how to do this using the command line but I cant seem to get started. I know there must be an easier way than a php script.

Any help would be greatly appreciated.

Thanks
Neil

[sdousley]

something like:

find /path/to/check -type f -iname '*' -perm '+r'

Look into the man page for find for the "-perm" option. That will probably be the best way

[drl]

Hi.

An example script:

#!/bin/sh

# @(#) s1       Demonstrate locating files which lack read permission.

# Remove previous debris.

rm -rf d1

# Establish test directory.

mkdir d1
cd d1
touch t1.gif t2.jpg t3.gif t4 t5 t6
chmod 333 t2.jpg
chmod 300 t3.gif
chmod 030 t4
chmod 003 t5
chmod 000 t6
ls -l
cd ..

echo
echo " These files lack read permission:"
find d1 ! -perm +444

echo
echo " These jpg files lack read permission:"
find d1 -iname '*.jpg' ! -perm +444

echo
echo " These jpg and gif files lack read permission:"
find d1 -iname '*.jpg' -o -iname '*.gif' ! -perm +444

exit 0

Which produces:

% ./s1
total 0
-rw-r--r--  1 drl drl 0 Mar 28 09:43 t1.gif
--wx-wx-wx  1 drl drl 0 Mar 28 09:43 t2.jpg
--wx------  1 drl drl 0 Mar 28 09:43 t3.gif
-----wx---  1 drl drl 0 Mar 28 09:43 t4
--------wx  1 drl drl 0 Mar 28 09:43 t5
----------  1 drl drl 0 Mar 28 09:43 t6

 These files lack read permission:
d1/t4
d1/t5
d1/t6
d1/t2.jpg
d1/t3.gif

 These jpg files lack read permission:
d1/t2.jpg

 These jpg and gif files lack read permission:
d1/t2.jpg
d1/t3.gif

See the tutorial at http://amitsharma.linuxbloggers.com/how_to_find.htm for a number of interesting uses of find ... cheers, drl