This script creates an app which launches Google Chrome with a new profile and allows for running multiple instances of Chrome simultaneously.

chrome-profile

#!/bin/bash
#
# This script creates an app which launches Google Chrome with a new profile
# and allows for running multiple instances of Chrome simultaneously.
#
# Based on: http://blog.duoconsulting.com/2011/03/13/multiple-profiles-in-google-chrome-for-os-x/

set -e

if [ $# == 0 ]; then
  echo "usage: chrome-profile profile_name"
  exit 1
fi

PROFILE_NAME=$1
mkdir -p "/Applications/Google Chrome $PROFILE_NAME.app/Contents/MacOS"

F="/Applications/Google Chrome $PROFILE_NAME.app/Contents/MacOS/Google Chrome $PROFILE_NAME"
cat > "$F" <<\EOF
#!/bin/bash

#
# Google Chrome for Mac with additional profile.
#

# Name your profile:
EOF

echo "PROFILE_NAME='$PROFILE_NAME'" >> "$F"

cat >> "$F" <<\EOF

# Store the profile here:
PROFILE_DIR="/Users/$USER/Library/Application Support/Google/Chrome ${PROFILE_NAME}"

# Find the Google Chrome binary:
CHOME_BIN="/Applications/Google Chrome.app/Contents/MacOS/Google Chrome"
if [[ ! -e "$CHOME_BIN" ]]; then
  echo "ERROR: Can not find Google Chrome.  Exiting."
  exit -1
fi

# Start me up!
exec "$CHOME_BIN" --enable-udd-profiles --user-data-dir="$PROFILE_DIR"
EOF

sudo chmod +x "$F"