Download and Copy or Move Primer Tutorial
Downloading from “the net” (“server land”) to your computer or device (“client land”) is a big part of the online experience and the sharing of data over the world wide web. But have you ever wondered about the two step design of …
- download from “the net” to a Downloads folder on your computer or device … and more often than not …
- you, the user, copies or renames this data to another location on your computer or device with command line or with operating system GUI
… ? Why not allow the “server” side define where it can download to on the “client”? Well, that would be a security nightmare, allowing a highjacking of mission critical files on your computer or device. So, I get it, that is a “no no”. But could we have a controlled “arrangement” between …
- the “server” side web applications/pages … and …
- a “client” side listener (like we talked about with Korn Shell listeners with Pandoc Document Conversion Email Tutorial)
… ? We think that sounds reasonable and so, today, we start our (two parts or more) mini-project (making step 2 above be considered to be programmatically handled, sometimes) designing a Korn Shell (“client” side) listener to suit our macOS “client” computer, executed as a background process via …
ksh download_copier.ksh &
But what is the conduit, if the “server” web applications/pages cannot define a destination folder other than the macOS Downloads folder for the user involved? Well, that is where we need either …
- Korn Shell interactive input (via read command) … or …
- additional argument … as per example …
ksh download_copier.ksh /Applications/MAMP/htdocs/ &
… if the folder to copy to is known ahead of time
… to define a “client land” folder to copy to (from the user’s Download folder (receiving the downloaded data).
That first Korn Shell read command interactive input was interesting to us for a command backgrounded via the “&” command suffix. But if stdin and stdout are not mentioned in the command you can answer this interactive input and then the processing the Korn Shell performs proceeds in the background. Exactly what we were hoping for, but weren’t sure that this was the case!
The picture is filled in better tomorrow as we discuss the conduit in more detail tomorrow.
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