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Batch convert PNG images to JPG

This requires imagemagick to be installed on the machine. Open up a terminal, cd into the folder with the PNG files and run:

ls -1 *.png | xargs -n 1 bash -c 'convert "$0" "${0%.*}.jpg"'

Broadcast in iTerm

iTerm for Mac has a broadcast feature that allows for input to be broadcast to all panes or tabs. This feature can be enabled through the Shell > Broadcast Input menu in the OS X menu bar. I found the keyboard shortcut Alt + Cmd + I to be particularly useful. It toggles broadcasting to all panes on and off. The iTerm 2 Beta 3 release also allows for the silencing of the pop-up alert that appears every time the broadcast feature is enabled (warning that input will be broadcast to all panes).