Bootstrap's watch functionality, without the dependencies (and bugs) 1) Put it in your bootstrap folder witht he filename "watch.sh" 2) Then chmod a+x watch.sh 3) Use ./watch.sh to run.

watch.sh

#!/bin/bash

# Credits:
# v1 (original code): Ian Vaughan (http://stackoverflow.com/a/4960140/105905)
# v2 (Minor changes): Maxime Haineault (https://gist.github.com/h3/5446756)

sha=0
previous_sha=0

update_sha()
{
    sha=`ls -lR . | sha1sum`
}

build () {
    echo
    echo
    echo "[preprocessor] monitoring filesystem... (Press enter to force a build/update)"
    make
}

changed () {
    echo "[preprocessor] file(s) changed, re-processing..."
    previous_sha=$sha
    build
}

compare () {
    update_sha
    if [[ $sha != $previous_sha ]] ; then changed; fi
}

run () {
    while true; do

        read -s -t 1 && (
            echo "[preprocessor] forced re-processing..."
            build
        )

        compare

    done
}

echo "[preprocessor] Watching for changes... (Press <enter> to force re-processing)"
run