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I've got an alias to open files in Sublime Text 2:

alias sub='/Applications/Sublime\ Text\\ Text\ 2'

But this spins up another instance of Sublime Text 2 (complete with restoring all the open files and folders in my other instance).

I would like to get files to open up as a tab in the current instance, which must be possible, since this is what right-click > Open with... > Sublime Text 2 does.

Any idea how to do that from the command line?

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That's not how it is for me. When I call subl file1 and then subl file2, it opens a new tab for file2 next to file1. Quite the contrary, when I call open -a 'Sublime Text 2' file2, I get a new Sublime window. – slhck Jan 17 '13 at 16:27
Can you confirm that your alias matches mine? Are you using & to keep the cmd prompt from holding on to the instance? Also, what are you settings for the following options in SublimeText2>Preferences>Settings-Default? // OS X only: When files are opened from finder, or by dragging onto the // dock icon, this controls if a new window is created or not. "open_files_in_new_window": true, // OS X only: This controls if an empty window is created at startup or not. "create_window_at_startup": true, – Summitch Jan 17 '13 at 18:24
up vote 3 down vote accepted

The reason it doesn't work is that you have the wrong alias. Here's the correct one:

alias sub='/Applications/Sublime Text'

This is an alias that Sublime Text specifically provides for OS X. It will not block execution and—by default—open files in a tab next to the ones that are already open.

If you want to know more about why your alias didn't work, read on.

Application packages in OS X have an .app suffix, but when launched, they actually launch a binary that's specified in Info.plist in said package. This is the binary your alias links to, in the MacOS folder.

Running an application from the GUI or through Launch Services (e.g. via osascript or open) makes OS X open that binary, but at the same time ensure it's only launching one instance of that app. When you call the binary directly, you bypass this restriction and launch another instance of the application—unless the application has measures for preventing two instances from being launched, which normally OS X handles.

Also, as a side effect, launching the binary will block the terminal execution until you exit the program or suspend it to the background. Using the built-in subl from Sublime Text 2 returns control to your terminal, as it actually uses a Launch Services call to open the Sublime package instead of addressing the binary in MacOS only.

Since you're basically launching a second Sublime Text 2 instance, it'll show you the files it previously had opened, because that's its default behavior.

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