condition to exit

ofer4 · 04-08-2012, 05:10 PM

hi

i want that the program will exit if the file does not consist @

i wrote this code however it does not run :

i will be happy for explanation why the script does not run and hoe to solve it

thanks in advance

Code:

fail=`echo $line | grep @`

if (( $?-eq 1)); then

exit 1

fi

Dark_Helmet · 04-08-2012, 05:34 PM

I am assuming you are using bash as your shell.

You have two separate problems.

1. The (( )) construct is to perform arithmetic. To perform tests on values, you use the [[ ]] construct

2. You must be mindful of spaces inside your condition. There must be a space between $? and your operator (-eq). There must also be a space between your last operand (1) and the end of the test condition (]])

Code:

#!/bin/bash

fail=`echo $line | grep @`
if [[ $? -eq 1 ]]; then
  exit 1
fi