Checking if root inside bash script

Question

I want to check if the user running the script is root or not before running. But it doesn't seem to work. I'm currently logged in as root, but its something wrong with the syntax I think.

if[[ $EUID -ne 0 ]];
then
 echo "Sorry, you are not root."
 exit 1
else
 echo "You are root, script will continue."
fi

You have a spacebar bug, see @user3553031's answer

jorgenkg
– jorgenkg

2014-04-23 23:08:22 +00:00
Commented Apr 23, 2014 at 23:08 — jorgenkg
– jorgenkg, Commented Apr 23, 2014 at 23:08

user3553031 · Accepted Answer · 2014-04-23 23:03:22Z

4

You need a space between if and [.

answered Apr 23, 2014 at 23:03

user3553031

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Comments

willeM_ Van Onsem · Accepted Answer · 2014-04-23 23:00:57Z

1

Why not simething like:

usrname=$(whoami)
if [ $usrname = "root" ]
echo "Sorry, you are not root."
 exit 1
else
  echo "You are root, script will continue."
fi

Although I think the problem is merely your syntax with the if statement:

Why double brackets
Why a ; after the if?
A space between if and [, thus if [

bash is very sensitive to syntax. For instance spaces between the assignment operator (=) are not allowed either.

answered Apr 23, 2014 at 23:00

willeM_ Van Onsem

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1 Comment

Kalyanam Rajashree Over a year ago

When I find that user is not my desired user, instead of exit, how can I run the rest of the script as my desired user? Please look at stackoverflow.com/questions/67646925/…

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