Shell function to block until files are written

await-change.sh

# while await-change *.c; do make && ./run; done
await_change () {
    ts=/tmp/await-change.$$
    : >$ts

    while sleep 0.3; do
        for fn in "$@"; do
            if [ $fn -nt $ts ]; then
                rm -f $ts
                return
            fi
        done
    done
}
alias await-change=await_change