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I’ve been working with a lot of files lately and they all are numbered. Thus far I’ve been relying on a lot of bash for loops to get exactly the files I want, but I knew there had be a better way. And there is… Refer to this question on Stack Overflow. Pretty great.

The only real problem is on Snow Leopard the default bash is 3.2.48(1). So something like {1..10} will expand properly to 1 2 3 4 5 6 7 8 9 10, but the incremental and 0 padding options won’t, i.e., {1..10..2} and {001..10} won’t work. They should expand to 1 3 5 7 9 and 001 002 003 004 005 006 007 008 009 010 respectively.

One solution is to upgrade bash on Snow Leopard. I am a believer in homebrew. It’s such a clean way to manage things in OSX (meaning its easy to remove packages and get back to base OSX if you ever want to, although Python seems like a pain and 2.6 is good enough for me so I don’t mess with that).

Anyways, here is what I did to upgrade my Bash on Snow Leopard.

  1. brew install bash
    • (optional) brew install bash-completion
  2. sudo vim /etc/shells
    • add /usr/local/bin/bash to the list
  3. Update your account,
    1. Goto Accounts Preference Pane
    2. Unlock so you can make changes (by clicking the lock in the bottom left and entering your password assuming you’re an admin)
    3. Control-Click your name and select Advanced Options...
    4. Under Login Shell: select /usr/local/bin/bash from the dropdown, or if it’s not there just type it in. It’ll be fine. Trust me I’m a doctor.
    5. Hit the OK (figuratively hit it, and by hit I mean click)

Now everything relating to brace expansion should work.