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Neil avatar Ubuntu

Execute permissions for all users not working as expected

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Neil

I have two bash scripts within /usr/local/bin and here are the permissions:

-rwxrwx--x 1 root root 33 Dec 30 12:18 hello.sh
-rw-r--r-- 1 root root 34 Dec 30 12:28 test.sh

Both scripts have the same contents:

#!/bin/bash

echo "Hello $USER!"

I am currently a user who does not have root privileges.

I would expect the following:

  • I cannot read hello.sh, but I can execute it via bash hello.sh
  • I can read test.sh. but I cannot execute it via bash test.sh

Reading both files works as expected, but execution of both files works opposite of my expectation:

  • I cannot execute hello.sh (even though I have execution privileges set for all users)
  • I can execute test.sh (even though I only have read privileges set for all users).

I am missing something here. What basic concept am I missing?

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Neil avatar Ubuntu
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Neil

I stumbled upon this post: https://unix.stackexchange.com/questions/34202/can-a-script-be-executable-but-not-readable

Ultimately, it appears that bash (the interpreter) is what is actually being executed. The interpreter needs read permissions on the file/script in order to execute the file/script.

So the answer: as long as you have execute permission on your interpreter (in this case bash) and read permissions on the file/script you intend to execute, then you should be good.

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