I had the same problem: I first downloaded my certificates to my small MacBook while on the run. When trying to install the certificates on my iMac... then I ran into the problems described on this page.

After spending hours pulling my hair out like many of you, I performed the following steps to fix it:

1. Close all your stuff except your webpage that should be logged into App Dev center.

2. Open Xcode. Click WINDOW > ORGANIZER. Then click the Devices tab and select "Provisioning Profiles" on the left. That should bring up your provisioning profiles. Highlight one by one (if more than 1), right click and delete profile. Yes, just do it! Delete them all! (I kept making a new one after a new one trying to make the thing work.)

3. From the first page you see after logging into the App Dev Center on the right side click "iOS PROVISIONING PORTAL" > (do not "launch assistant"). Instead click on the left side. Select CERTIFICATES. You will probably have just one line listed with your name/company - from there click on the right side REVOKE. Click OK to verify that's what you want to do.

4. On the same page click DEVICES. Click the box next to your device you are trying to provision and click REMOVE SELECTED. Again click OK to verify.

5. Wait about 2 minutes to let Apple do their thing.

6. Now click on "HOME" that is on the left side navigation.

7. Click "Launch Assistant"

8. create a new app ID - call it whatever you want. Just make sure it's unique enough to know that's the one you just created because the others you've been messing with all day will not be deleted from Apples Dev Center.

9. You should be able to follow the rest of the Assistant without troubles -- the main thing is you just had to delete your old provision profiles and start over.

Good Luck!

fswatch

fswatch is a small program using the Mac OS X FSEvents API to monitor a directory. When an event about any change to that directory is received, the specified shell command is executed by /bin/bash

If you're on GNU/Linux, inotifywatch (part of the inotify-tools package on most distributions) provides similar functionality.

Update: fswatch can now be used across many platforms including BSD, Debian, and Windows.

Syntax / A Simple Example

The new way that can watch multiple paths - for versions 1.x and higher:

fswatch -o ~/path/to/watch | xargs -n1 -I{} ~/script/to/run/when/files/change.sh

Note: The number output by -o will get added to the end of the xargs command if not for the -I{}. If you do choose to use that number, place {} anywhere in your command.

The older way for versions 0.x:

fswatch ~/path/to/watch ~/script/to/run/when/files/change.sh

Installation with Homebrew

As of 9/12/13 it was added back in to homebrew - yay! So, update your formula list (brew update) and then all you need to do is:

brew install fswatch

Installation without Homebrew

Type these commands in Terminal.app

cd /tmp
git clone https://github.com/alandipert/fswatch
cd fswatch/
make
cp fswatch /usr/local/bin/fswatch

If you don't have a c compiler on your system you may need to install Xcode or Xcode command line tools - both free. However, if that is the case, you should probably just check out homebrew.

Additional Options for fswatch version 1.x

Usage:
fswatch [OPTION] ... path ...

Options:
 -0, --print0          Use the ASCII NUL character (0) as line separator.
 -1, --one-event       Exit fsw after the first set of events is received.
 -e, --exclude=REGEX   Exclude paths matching REGEX.
 -E, --extended        Use exended regular expressions.
 -f, --format-time     Print the event time using the specified format.
 -h, --help            Show this message.
 -i, --insensitive     Use case insensitive regular expressions.
 -k, --kqueue          Use the kqueue monitor.
 -l, --latency=DOUBLE  Set the latency.
 -L, --follow-links    Follow symbolic links.
 -n, --numeric         Print a numeric event mask.
 -o, --one-per-batch   Print a single message with the number of change events.
                       in the current batch.
 -p, --poll            Use the poll monitor.
 -r, --recursive       Recurse subdirectories.
 -t, --timestamp       Print the event timestamp.
 -u, --utc-time        Print the event time as UTC time.
 -v, --verbose         Print verbose output.
 -x, --event-flags     Print the event flags.

See the man page for more information.