CODEWITHSUNDEEP
cbash
Mr. Joe
Mr. Joe

Reputation: 1

How can I change this script

So I have this script to check if a number is the one I expected to be. But I want to test it with the C program output directly, not storing the results on a file.

#!/bin/bash
j=0;
for i in {1..100};
do ./a.out > output;
cmp expected output || let "j+=1";
done
echo $j;

The ./a.out is referred to a program that prints a number. I want to check if it's the same as the stored on expected but without using files

Upvotes: 0

Views: 55

Answers (2)

George Vasiliou
George Vasiliou

Reputation: 6345

This worked fine for me (by replacing a.out with a simple echo script):

#!/bin/bash
j=0;
for i in {1..100};
cmp expected <(./a.out) || let "j+=1";
done
echo $j;

man bash:

Process Substitution
Process substitution allows a process's input or output to be referred to using a filename. It takes the form of <(list) or >(list). The process list is run asynchronously, and its input or output appears as a filename.

Upvotes: 1

Barmar
Barmar

Reputation: 781513

You can substitute the output of a command into the command line with $(command).

expected=$(< expected)
j=0
for i in {1..100}; do
    test "$(./a.out)" = "$expected" || let j+=1
done
echo $j

Upvotes: 0

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