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Old 11-29-2008, 04:11 AM   #1
Lynda_M
LQ Newbie
 
Registered: Nov 2008
Posts: 3

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Unhappy error: unary operator expected ??


Hi everyone,
I'm a Linux newbie and would appreciate any help solving my issue...
I'm running a script to set up Linux OS environment, the script works great but i get an error on the following portion:

if [ $USERNAME != "root" ]
then
echo "Cannot proceed with setup.You must be logged in as root!"
exit
else
proc=m
while [ $proc != "y" -a $proc != "Y" -a $proc != "n" -a $proc != "N" ]
do
echo -n "Are you ready to proceed?(Y/N)"
read proc
if [ $proc == "n" -o $proc == "N" ]
then
exit
else
if [ $proc == "y" -o $proc == "Y" ]
then
continue
fi
fi
done
fi

The error i get:
line:2 [: !=: unary operator expected.
But the script continues to run...
Any help eliminating that error please!
Thanks in advance.
 
Old 11-29-2008, 05:02 AM   #2
druuna
LQ Veteran
 
Registered: Sep 2003
Posts: 10,532
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Hi,

Is there the possibility that $USERNAME is empty?

If that is the case then if [ $USERNAME != "root" ] will resolve to if [ != "root" ], which will throw the error shown by you.

Put quotes around the variable to solve this: if [ "$USERNAME" != "root" ].

Hope this helps.
 
Old 11-29-2008, 05:05 AM   #3
druuna
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Registered: Sep 2003
Posts: 10,532
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I just noticed that you crossposted this question: DON'T DO THAT!!! Read the rules before you start using this (or any) forum.
 
Old 11-29-2008, 08:03 PM   #4
crabboy
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Registered: Feb 2001
Location: Atlanta, GA
Distribution: Slackware
Posts: 1,823

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Closing, duplicate of: http://www.linuxquestions.org/questi...-error-687011/
 
  


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