Ok, so. If you have ever wanted to run a tekkit server on mac (as I have), you have probably noticed that there is no file to launch the mac server. This simple fix can help.
1. Download Tekkit server
2. Unzip folder, if necessary
3. Rename folder to: Tekkit Server
4. Place Folder on desktop
5. Open "launch.sh" in textedit
6. Delete the text in this file, and paste this:
cd ~/Desktop/Tekkit\ Server
java -Xincgc -Xmx2048M -Xms2048M -jar Tekkit.jar
7. Save and close file
8. Right click "launch.sh" and click Get info
Change extension from ".sh" to ".command"
9. Run Launch.command in Terminal!
That's It! If the server doesnt launch, follow bukkit's steps to set up a bukkit server, then move the Launch file from your bukkit server folder to your tekkit server folder, and paste the code above into it, replacing the other code.
On another note. Replace the 2048M in the code with the ram specs you want.