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cant figure out the error in this script (adding numbers in a string) using ubantu shell

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# 1  
Old 10-19-2012
cant figure out the error in this script (adding numbers in a string) using ubantu shell
hii please help me this is the script
Code:
num=$1
sum=0

while [$num -ne 0]
do
x=`expr $num % 10`
sum=`expr $sum + $x`
num=`expr $num / 10`

done

echo "Summation is $sum"

it is giving error

pratyush@ubuntu:~$ sh shell.sh 123
shell.sh: 11: 123: not found
Summation is 0

please help!!!
# 2  
Old 10-19-2012
Code:
while [ $num -ne 0 ]

(space after [ and space before ] )
This User Gave Thanks to vgersh99 For This Post:
Pratyush Sakhle
# 3  
Old 10-19-2012
Also, you don't have to use expr here.

Code:
let X=num%10

Much more efficient.
This User Gave Thanks to Corona688 For This Post:
Pratyush Sakhle
# 4  
Old 10-19-2012
Quote:
Originally Posted by vgersh99
Code:
while [ $num -ne 0 ]

(space after [ and space before ] )
This worked thankyou very much Smilie
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