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    <p>I don't think such filtering is possible out of the box. But it's possible to redirect <code>stderr</code> (which is used by <code>NSLog</code>) into a pipe, read from that pipe in a background thread and then print messages that pass through the filter onto <code>stdout</code> (which is captured by the debugger as well). This code does the job:</p> <pre><code>int main(int argc, char *argv[]) { dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0), ^(void) { size_t const BUFFER_SIZE = 2048; // Create a pipe int pipe_in_out[2]; if (pipe(pipe_in_out) == -1) return; // Connect the 'in' end of the pipe to the stderr if (dup2(pipe_in_out[1], STDERR_FILENO) == -1) return; char *buffer = malloc(BUFFER_SIZE); if (buffer == 0) return; for (;;) { // Read from the 'out' end of the pipe ssize_t bytes_read = read(pipe_in_out[0], buffer, BUFFER_SIZE); if (bytes_read &lt;= 0) break; // Filter and print to stdout if (should_show(buffer)) // TODO: Apply filters here fwrite(buffer, 1, bytes_read, stdout); } free(buffer); close(pipe_in_out[1]); }); // Rest of main } </code></pre> <p>Please note that this code is quite simple and doesn't handle all corner cases. First of all it captures all <code>stderr</code> output and not just <code>NSLog</code>. Maybe this could be filtered out by checking against the content. <code>NSLog</code> output always starts with the date and time.</p> <p>Second problem with this code is that it doesn't try to split/join strings it reads from the pipe. There's no guarantee that there will be one <code>NSLog</code> per read. They could be coming together or be too long and would be split. To handle this it would require additional processing of the data read from the pipe.</p> <p>Anyway, for many practical purposes this should be enough.</p>
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