Question

I have below lines in my shell script.

#!/bin/bash

counter=0
counter=$((counter+1))
echo $counter

And I need to run the above shell script like this-

sh -x test.sh

Whenever I try to run the above script, I awlays get error as –

`counter=$' unexpected

Any suggestions what changed I need to make there?

Updated Script:

#!/bin/bash

counter=0
counter=$(($counter+1))
echo $counter

Answer 1

Try:

#!/bin/sh

counter=0
counter=`expr $counter + 1`
echo $counter

$ sh -x test.sh

+ counter=0
++ expr + 1
+ counter=1
+ echo 1
1