Shell Programming and Scripting

With instructions this big and vague, it's hard to give better answers than "step 1: have an sftp server". Really, all I have are questions.

1a) Do you have any control over what is sending the files? If at all possible, you should have the sender move the file to a different folder once it's finished sending, to signal that the file is complete. Trying to tell if an upload is complete or not without the client's assistance is really hard and error-prone.

1b) Does anyone but this process need to access those files? Ideally it could have its own account, locked to sftponly.

2a) "Passed onto the internal network" - what does that mean?
2b) 'comes to folder a' - on the same machine or a different one?
2c) Transferred how?

3a) How was it encrypted? 7zip, same as later?

4a) Do you have mail configured on your linux system?

5a) Copied or moved?
5b) Are you keeping the originals? Why or why not?

In addition to what Corona already said/asked:

Really? What should that be good for? I can understand to compress data for transportation purposes to save bandwidth, but if you move around a file inside your own network this is simply not worth the effort.

Note that Lempel-Ziv is a compression algorithm, not an encryption. Everybody with a working copy of the unzip utility (if i remember correctly there are few of these out there) can decode it. It you need encryption go for something the modern OpenSSL library offers. You will need to create and distribute keys for this to work, then.

I hope this helps.

bakunin