CODEWITHSUNDEEP
cunix
user5735760
user5735760

Reputation:

Redirect ls using execl

I'd like to use ls from execl and redirect the output to a file, which exists. I tried with this:

int value = execl("/bin/ls","ls","-l",">/home/sbam/myfile",NULL);

But it doesn't work... How can I do?

Thanks.

Upvotes: 0

Views: 238

Answers (1)

Some programmer dude
Some programmer dude

Reputation: 409356

Redirection is part of the shell and not something the commands handles. Either invoke a shell and execute the command through the shell, or you could open the file using open and use dup2 to make the file the process standard output.

Something like

int fd = open("/home/sbam/myfile", O_CREAT | O_WRONLY, 0644);
if (fd != -1)
{
    if (dup2(fd, STDOUT_FILENO) != -1)
    {
        if (execl("/bin/ls", "ls", "-l", NULL) == -1)
            perror("execl");
    }
    else
        perror("dup2");
}
else
    perror("open");

Upvotes: 1

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