CODEWITHSUNDEEP
cxcode
Cesare
Cesare

Reputation: 9419

How to work with C pipes on a Mac?

I'm experimenting with pipes in C. I want to connect the Standard Output of file1:

int main() {
    printf("6");
}

...to the Standard Input of file2:

int main() {
    int number;
    scanf("%d", &number);
    printf("The number is %d.", number);
}

The output should be: The number is 6. In Xcode, file1 is appended to the executable (the target). I open the Terminal app, change the directory to the Debug folder (which contains the executable file) and issue this line:

.\TestDrive | /usr/someone/somewhere/file2.c

TestDrive is the name of the executable file (that contains file1). Since file2 is not contained in the Debug folder, I have to specify the full path of it. If you wish, you can download the project here.

In the console, I get Permission denied. What am I doing wrong?

Upvotes: 1

Views: 329

Answers (2)

Scott Hunter
Scott Hunter

Reputation: 49803

If you are piping into /usr/someone/somewhere/file2.c, it is expected that that file is executable; .c files generally are not, but the file that got generated by compiling it probably is.

Upvotes: 2

Marc_Alx
Marc_Alx

Reputation: 1441

You should make your TestDrive file executable, from the command line via chmod.

Upvotes: -1

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