Update to monitor.sh, this time its serious! This monitors a group of directories, and if a file in one of them changes it only actions that directory command.

monitor2.sh

#!/bin/bash
# Update to monitor.sh, this time its serious! 
# This monitors a group of directories for source file changes, and if a file in one of them changes it only actions that directory command.
# It does this via creating a SHA of the ls tree of the folder in question, and if changed, triggers the action.

# The "action" is just the variable $command, normally make.
# Usage :
# ./monitor.sh
# Then save a file, and it gets built! Magic!

# Pass in anything to use on the target

commands=("make clean" "make" "./load")

mode=0
if [ $1 ]; then
    echo "--> Monitor: " $*
    mode=1
fi

# allow make commands to be passed to each make
# eg monitor.sh wc -> to go thr each wc
# as well as "install" to make clean && ...

# could get automaticly? but order might be important, and might have dirs not wanted to build
#DIRS=`ls`
DIRS=('driver' 'lib' 'test')

declare -a sha
declare -a previous_sha
has_changed=0

update_sha()
{
    sha[$1]=`ls -lR . | egrep '\.c|\.cpp|\.h|\.spt' | sha1sum`
}

build () {
    #echo "--> Monitor: Building... | ${DIRS[$1]} |"
    echo "------| ${DIRS[$1]} |----------------------------------------------------------------------------------------------------------"

    if [ $mode == 0 ]; then
        make clean && make && make update
    fi
    if [ $mode == 1 ]; then
        sudo sh -c "make clean && make && make install"
    fi
    #echo "--> Monitor: Monitoring filesystem... (Press enter to force a build/update)"
}

changed () {
    build $1
    previous_sha[$1]=${sha[$1]}
    has_changed=1
}

compare () {
    update_sha $1
    [[ ${sha[$1]} != ${previous_sha[$1]} ]] && changed $1
}

check () {
    if [ -f .updated ]; then
        if [ `cat .updated` != 0 ]; then
            echo 0 > .updated
            build
        fi
    fi
}

run () {
    while true; do

        for index in ${!DIRS[*]}; do
            cd ${DIRS[$index]}
            compare $index
            cd ..
        done

        if [ $has_changed == 1 ]; then
            echo "--> Monitor: Monitoring filesystem... (Press enter to force a build/update)"
            has_changed=0
        fi

        read -s -t 1 && (
            echo -e "\n--> Monitor: Forced Update <-- \n"
            for index in ${!DIRS[*]}; do
                cd ${DIRS[$index]}
                build $index
                cd ..
            done
            echo "--> Monitor: Monitoring filesystem... (Press enter to force a build/update)"
        )

    done
}

echo "--> Monitor: Init..."
echo "--> Monitor: Monitoring filesystem... (Press enter to force a build/update)"
run