use "core"

action [sh> %cmd]
    lua> ".."
        local result = io.popen(\%cmd)
        local contents = result:read("*a")
        result:close()
        return contents

action [read file %filename]
    lua> ".."
        local file = io.open(\%filename)
        local contents = file:read("*a")
        file:close()
        return contents

action [write to file %filename %text, to file %filename write %text]
    lua> ".."
        local file = io.open(\%filename, 'w')
        file:write(\%text)
        file:close()