Using inotify to detect changes in a file. This case is used for less files to compile them

watch.sh

if which inotifywait >/dev/null; then # Checks to see if inotify tools exists
    folder=`pwd`; # This is where it searches - pwd will run that command and run the rest based on your current folder
    while true;
        do
            N=`find $folder -name "*.less"`; # Currently searches for all .less files in the folder above using a standard find command
            if [[ -z $N ]]; then # If there is nothing found then it exits
                echo There are no LESS files to be found - maybe cd to where there is some.
                exit;
            else
                    fileout=`inotifywait -qe modify $N`; # Gets the name of the file that was modified
                    newfileout=${fileout/ MODIFY/}; # get the path of the modified file
                    stripped_file=${newfileout/$folder\//} # remove the pwd from the path
                    echo -e "\e[90mFound changes in: $stripped_file - compiling..."; # Echo what its found
                    for f in $newfileout; # For each file in the modified string (normally one)
                        do
                                n=${f/css\/less/css} # replace css/less in the path with css
                                compile=`lessc --verbose --yui-compress $f ${n%.*}.css`; # run the lessc command
                                if [ "$compile" ]
                                then
                                        echo -e "\e[32mCompiled\e[0m: $stripped_file -  at `date +"%T"`."; # echo that its compiled
                                fi
                    done;
            fi
    done;
else
    echo Please install inotify-tools
fi