Bash tricks

gistfile1.sh

#!/bin/bash
# Rename multiple files
for i in *.html; do mv $i ${i%.*}.tpl; done;

# Create file of specified size (1G)
dd if=/dev/zero of=sparse_file bs=1073741824 skip=1073741824 count=1

# Resample images so height and width aren't greater than specified size. Save in thumbnails folder
for i in Photo*.jpg; do sips -Z 100 $i --out thumbnails/${i%.*}_thumb.${i##*.}; done

# Reset VM
VBoxManage controlvm Debian reset

# MacPorts
# set system default PHP version to 5.4
sudo port select --set php php54

# Resume VM
VBoxManage startvm Debian --type headless

# Save VM state
VBoxManage controlvm Debian savestate