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Top Forums UNIX for Advanced & Expert Users Syntax when using the 'exec' command Post 302985378 by hungryd on Tuesday 8th of November 2016 04:38:49 PM
Old 11-08-2016
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.

Quote:
Originally Posted by jlliagre
I slightly disagree.

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

will have the current, likely non provileged 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 in the "$logfile".

This log file will belong to the regular user running the command (at least if it wasn't already existing), not root.
 

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GKSU(1) 						      General Commands Manual							   GKSU(1)

NAME
gksu - a Gtk+ su frontend SYNOPSIS
gksu [ options ] <command> gksudo [ options ] <command> DESCRIPTION
This manual page documents briefly gksu and gksudo gksu is a frontend to su and gksudo is a frontend to sudo. Their primary purpose is to run graphical commands that need root without the need to run an X terminal emulator and using su directly. OPTIONS
These programs follow the usual GNU command line syntax, with long options starting with two dashes (`-'). A summary of options is included below. Common Options: --user <user>, -u <user> Calls <command> as the specified user --message <message>, -m <message> Replaces the standard message shown to ask for password for the argument passed to the option --sudo-mode, -S Use sudo instead of su as backend authentication system. Notice that the X authorization magic will not work when using sudo for target users other than root. --title <title>, -t <title> Replaces the default title with the argument --icon <icon>, -i <icon> Replaces the default window icon with the argument --print-pass, -p Asks gksu to print the password to stdout, just like ssh-askpass. Useful to use in scripts with programs that accept receiving the password on stdin. --disable-grab, -g Disables the "locking" of the keyboard, mouse, and focus done by the program when asking for password --ssh-fwd, -s Strip the host part of the $DISPLAY variable, so that GKSu will work on SSH X11 Forwarding. --login, -l Makes this a login shell. Beware this may cause problems with the Xauthority magic. Run xhost to allow the target user to open win- dows on your display! This is ignored if running with sudo as backend for authentication. --preserve-env, -k Preserve the current environments, does not set $HOME nor $PATH, for example. FILES
/etc/gksu.conf Configuration file to setup system-wide defaults for gksu/gksudo. It provides an option to force the display grabing, also. RETURN VALUE
On success, gksu will return 0. If an authentication error ocurred, it will exit with error code 3. If the user canceled the dialog or closed the window, it will return error code 2. On other error conditions, gksu will return 1. NOTE
Note that <command> and all its arguments should be passed as one single argument to gksu just like one would to when using su. SEE ALSO
su(1), gksuexec(1). AUTHOR
This manual page was written by Gustavo Noronha Silva <kov@debian.org> for the Debian GNU/Linux system (but may be used by others). 2003 GKSU(1)
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