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Top Forums Shell Programming and Scripting Executing bash file with sudo for the second time, leads to permission denied, for some commands Post 303033340 by boqsc on Wednesday 3rd of April 2019 03:05:55 PM
Old 04-03-2019
Executing bash file with sudo for the second time, leads to permission denied, for commands

I have a script that checks if the script has been ran with sudo.
If the script is not ran as sudo, the current script is being executed with exec sudo bash.
You are asked for a password, you type in the password, success. Everything is perfect - the commands inside the script are ran as sudo.
However, the second time you run the script, you are getting cat: /etc/sudoers: Permission denied

What is this happening and how can this be fixed?


Output of the Script:

Code:
vaidas@vaidas-SATELLITE-L855:~$ cd Desktop
vaidas@vaidas-SATELLITE-L855:~/Desktop$ bash shellscript.sh 
sudo: a password is required
[sudo] password for vaidas: 
----------YAS HAVE SUDO----------
#
# This file MUST be edited with the 'visudo' command as root.
#
# Please consider adding local content in /etc/sudoers.d/ instead of
# directly modifying this file.
#
# See the man page for details on how to write a sudoers file.
#
Defaults    env_reset
Defaults    mail_badpass
vaidas@vaidas-SATELLITE-L855:~/Desktop$ bash shellscript.sh 
----------YAS HAVE SUDO----------
head: cannot open '/etc/sudoers' for reading: Permission denied
vaidas@vaidas-SATELLITE-L855:~/Desktop$

The Script:
Code:
#!/bin/bash

if sudo -n true;
then
  echo "----------YAS HAVE SUDO----------";
  head /etc/sudoers;
  
else
  exec sudo bash "$0" "$@";
fi


Last edited by boqsc; 04-03-2019 at 04:32 PM..
 

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COMMAND-NOT-FOUND(1)					    http://en.opensuse.org/Sco					      COMMAND-NOT-FOUND(1)

NAME
command-not-found - A command-not-found handler SYNOPSIS
command-not-found {binary_name} {repository} ARGUMENTS
The following arguments are required: binary_name The name of binary you are looking for. repository The name of repository for search. For most cases, use zypp DESCRIPTION
command-not-found handler is designed to tell users which package contains a missing command. The handler is integrated to bash(1) and zsh(1) shells and is not necessary to call it directly. Just type a name of the command in your favourite shell and you'll get a result. If you consider c-n-f handler useless, just add unset command_not_found_handle to your profile or remove the command-not-found package. Handler doesn't call the command-not-found binary directly, it only prints info about it. If you want to invoke it automatically, just add export COMMAND_NOT_FOUND_AUTO=1 to your bash profile. EXAMPLE
: NORMAL USAGE For example you want to try blender, because you have heard that is an amazing program. So just type blender in shell: $ blender You get the following output: The program 'blender' can be found in the following package: * blender [ path: /usr/bin/blender, repository: zypp (openSUSE 11.1-0) ] Try installing with: sudo zypper install blender bash: blender: command not found SEE ALSO
scout(1) AUTHOR
Pavol Rusnak <stick@gk2.sk> Developer http://gitorious.org/opensus 08/07/2009 COMMAND-NOT-FOUND(1)
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