Execute permission issue

hijoshi · 03-13-2014, 06:17 AM

I have a script and trying to give execution access to rest all without giving them permission to read. But without giving read permission other users, they are not able to execute the script. The error is "Permission Denied". I have tried to set SUID bit, but even with that execution permission is denied. How can allow other users to execute without giving them read access.

Please help.

nigelc · 03-13-2014, 06:44 AM

Hello,
Maybe the path is wrong.
You could try

Code:

 echo $PATH

If it is not in the path it wont execute.

hijoshi · 03-13-2014, 07:03 AM

Path is not problem. For Path kind off problem, the script will not execute even with read permission. In this case the moment, I give Read permission to all, execution is permitted.

michaelk · 03-13-2014, 07:11 AM

The shell requires read permission to be able to execute the script. You can use sudo which allows a user to execute commands as root or another user.

hijoshi · 03-14-2014, 03:39 AM

I tried executing by loign of file owner itself without read permission, execution permissions are denied. Refer logs below. Here server is ABCDE & user is lsm with home directory /home/lsm

[ABCDE:/home/lsm] ls -ltr trl1
-r-xr-xr-x 1 lsm aceman 20 Mar 14 14:01 trl1
[ABCDE:/home/lsm] cat trl1
#!/bin/bash
echo hi
[ABCDE:/home/lsm] ./trl1
hi
[ABCDE:/home/lsm] chmod -r trl1
[ABCDE:/home/lsm] ./trl1
/bin/bash: ./trl1: Permission denied
[ABCDE:/home/lsm]

Thanks in advance for help.

pan64 · 03-14-2014, 03:45 AM

that will not work. A text file (shell script) needs read permission, because it is not executed by itself but read by the interpreter.

hijoshi · 03-14-2014, 04:03 AM

So what is the suggested method, if I want to give Execution only permission to other users (other than the file owner) but not read permission ?

pan64 · 03-14-2014, 04:08 AM

you are not allowed to use scripts in that case. So you need to use binaries, you can convert your scripts to binary.
see shc: http://www.datsi.fi.upm.es/~frosal/sources/shc.html

michaelk · 03-14-2014, 06:15 AM

As stated you can use sudo:

Code:

#!/bin/bash
echo 'Hello world'

#ls -l test
-rwx------ 1 root root 31 2014-03-14 06:04 test

$./test
bash: ./test: Permission denied

$cat test
cat: test: Permission denied

$ sudo ./test
Hello world