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Top Forums Shell Programming and Scripting Trying to create a script to run as root, permission denied Post 302799557 by Corona688 on Friday 26th of April 2013 05:02:52 PM
Old 04-26-2013
This command does not do what you think it does:

Code:
sudo cat <<EOF >> launchd.conf
umask 000
EOF

Let me explain in detail the order which it does these things.
  • Redirects 'umask 000' into stdin
  • Redirects stdout into launchd.conf
  • Forks and executes 'sudo cat', letting it inherit these I/O redirections

You see the problem? It opens the files before it runs sudo. It has to -- you can't alter stdin and stdout for a program that's already running, you have to set them up first. By the time you call sudo, your shell has already tried and failed to open the file.

You have to run all that code inside sudo, since sudo is the thing with elevated permissions.

Code:
sudo bash <<EOF
        echo "umask 000" >> launchd.conf
EOF

 

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