I am trying to compile a c++ file and produce output using node and match it with the answer file that I have. And find the diff between my answer.txt and output.txt , in terminal when I run those command it shows me the line where they both differed 1st time , but when i run through node if both file are same I dont get anything same as my terminal , but when my output.txt file does not matches with answer.txt file I get an Error saying command failed using node , and line where they differed first time in my terminal .
exec(
`cd ${dirprob} && g++ ${job.filepath} -o testprogram && ./testprogram <input.txt >output.txt && diff output.txt answer.txt ` ,
(error,stdout , stderr)=>{
if (error) {
return ;
}
if (stderr) {
console.log(`stderr: ${stderr}`);
return ;
}
console.log(`stdout: ${stdout}`);
return ;
})
above is the code of my exec function
>Solution :
You are misunderstanding what error means in exec. It is the return code of the program you ran, and diff will return a non-zero code when the files are not equal. So this is not an error in the sense that the command failed. But in your code you are bailing when it happens.
Just remove the if (error) { return; }.
Btw, you should probably break down the long exec command string, too, and use cwd to set the working directory rather than cding. Ideally you’d have the diff call be completely separate so that you can be sure that errors (that I propose to ignore) are indeed coming from that.