Alfred Powerpack allows users to use extensions. And I do need a shortcut to sleep my displays. That’s how it comes from.

A simple extension to sleep display quickly. It’s a wrapper of a binary file. The code to generate the binary is from Command to Sleep Display OSX

#include <CoreFoundation/CoreFoundation.h>
#include <IOKit/IOKitLib.h>

/* Returns 0 on success and 1 on failure. */
int display_sleep(void)
    io_registry_entry_t reg = IORegistryEntryFromPath(kIOMasterPortDefault, "IOService:/IOResources/IODisplayWrangler");
    if (reg) {
                IORegistryEntrySetCFProperty(reg, CFSTR("IORequestIdle"), kCFBooleanTrue);
        } else {
                return 1;
        return 0;

At the beginning, I cannot run the binary inside the extension directory, but my home or my previous session’s directory. And that’s because I didn’t check the “Silent” option, which makes the default startup directory is the extension’s.

Well, it’s easy to use: just type the keyword, and hit Enter. What I hope is Alfred 1.0 to support Global Hotkeys for extensions.

Oh, forgot to say, Download it here.

Update I’ve seen some searches for a version for Alfred 2 directed here, so here is the one.

PS, PadLock is another app doing the same thing costing $2.99. The other feature of the app is to give you the buffer to cancel the lock operation, useful also.