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Top Forums UNIX for Advanced & Expert Users Syntax when using the 'exec' command Post 302985386 by Don Cragun on Tuesday 8th of November 2016 11:03:10 PM
Old 11-09-2016
Quote:
Originally Posted by jlliagre
I slightly disagree.

The command:
Code:
sudo exec >> $logFile 2>&1

will have the current, likely non privileged shell, redirect both stdout and stderr of the sudo command to the file named "$logfile", then sudo will (try to) run the regular exec command with no argument.

As it is very unlikely for a regular exec command to exist in the first place, being meaningless as an external command and only implemented as a builtin, this triggers an error message stating "sudo: exec: command not found" or similar written in "$logfile".

This log file will belong to the regular user running the command (at least if it wasn't already existing), not root.
Hi jlliagre,
Yes. You are correct. To get what I was describing in post #2, you would need to use:
Code:
sudo sh -c "exec >> $logFile 2>&1"

Quote:
Originally Posted by hungryd
The debate over what my previous code may or may not do is worthwhile but not the point of my post. The point was to ask: how can i automate -- inside of the script -- for stdout and stderr to be re-directed to the same file, something that usually requires entering an admin password.

Thank you for helping to focus on that.
We are sorry that you are not interested in understanding why what you have asked cannot be done. That doesn't alter the fact that IT CANNOT BE DONE. Either you have permission to open the file to which you want to redirect output for writing without extended privileges, or you run the entire script with extended privileges. Redirecting output to a file in a sudo command will not grant other parts of that script that are not being run with extended privileges the ability to write to a file that it can't open for writing.

You could use sudo in your script to make the log file writeable by everyone using chmod. You could use sudo to run chown or chgrp to change the file's owner and/or group so you can write to it. You could use sudo to set an ACL allowing your user-ID or group-ID write access (if your system supports ACLs). Or, as I suggested in post #2, you could elevate the privileges of your entire script by running it with sudo. But, you cannot redirect output to a file that you don't have permission to write to in a sudo command to make that file writeable by the remainder of that script.
 

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