Bash functions to run commands in all sub directories

run-in-dirs.sh

# do something in each subfolder, excludes hidden folders
function foreach_dir(){
    for arg in $(ls --color=none); do
        if [ -d "$arg" ] ; then
            cd $arg
            eval $@
            cd ..
        fi
    done
}

# do something in each subfolder in parralell, excludes hidden folders
function foreach_dir-threaded(){
    for arg in $(ls --color=none); do
        if [ -d "$arg" ] ; then
            cd $arg
            $@ >/dev/null 2>&1 &
            cd ..
        fi
    done
    echo "Started..."
    wait
    echo "Done!"
}