automatically add the tool to your path

tools.sh

#!/bin/bash
# which programs do you want to install into your path?

programs=( groovy grails gradle scala )

# relies on the conventions:
# 1. all tools go into ~/tools
# 2. all tools are configured with a 'current' symlink for
#    the currently in-use version
# 3. all tools have a 'bin' directory
# 4. call this from your .bashrc or .profile or whatever

# for example: to upgrade from grails 1.3.6 to 1.3.7 
# $ cd ~/tools/grails
# $ rm current
# $ ln -s grails-1.3.7 current

for program in "${programs[@]}"
do
    bindir="$HOME/tools/$program/current/bin"
    if [ -d "$bindir" ]; then
        PATH="$bindir:$PATH"
    fi
done
export PATH