Hi,
I have a sh script which contains the following line
TOTAL=$((e4-s4)) -> Where e4 and s4 are input got from the user.
At the time of execution of this line the following error occurs
test.sh: syntax error at line 8: `TOTAL=$' unexpected
How to solve this issue?. Can any one help me please?.........................
Regards
Revathi
We need to see the rest of the script to tell why that statement was unexpected.
I don't know the $((...)) syntax, but it could be from a more exotice shell and not recognised by the Bourne shell.
This should work (for integer arithmetic):
let total=e4-s4
The following is more portable:
TOTAL=`expr $e4 - $s4`
From the syntax $((expression)) it looks like your script was probably written to take advantage of
specific features in the bash shell. As a result your shell script will not be very portable to
non-Linux/GNU systems unless bash is available on these systems.
Below is my script
#!/bin/bash
echo "Enter the start IP"
IFS="."
read s1 s2 s3 s4
echo "Enter the End IP"
IFS="."
read e1 e2 e3 e4
TOTAL=$(($e4 - $s4))
echo "Total is $TOTAL"
Any idea
You suggestion does not work.
Below is my script
#!/bin/bash
echo "Enter the start IP"
IFS="."
read s1 s2 s3 s4
echo "Enter the End IP"
IFS="."
read e1 e2 e3 e4
TOTAL=$(($e4 - $s4))
echo "Total is $TOTAL"
Any idea
You suggestion does not work.
Below is my script
#!/bin/bash
echo "Enter the start IP"
IFS="."
read s1 s2 s3 s4
echo "Enter the End IP"
IFS="."
read e1 e2 e3 e4
TOTAL=$(($e4 - $s4))
echo "Total is $TOTAL"
Any idea
Your script is fine. Can you let us know how you are running it? As in, is the script an executable and are you running as: ./test.sh? Or are you running the script as: sh test.sh?
My guess is that it is the latter. In that case, the first line (#!/bin/bash) does not matter, and you are running the script using /bin/sh - which does not support $(( )).
Suggest that you follow fpmurphy's suggestion or make the script executable and run as ./test.sh
Thanks for ur valuable reply.........
TOTAL=`expr $e4 - $s4`
The above works fine..............
The error i did is i din leave space between the variables(i.e TOTAL=`expr $e4-$s4`)
Thanks
Revathi
Works fine for me as test.sh with a chmod +x on it (bash shell)