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Top Forums Shell Programming and Scripting Wait for file to get copied in server path and then proceed Post 302914759 by DGPickett on Wednesday 27th of August 2014 03:51:18 PM
Old 08-27-2014
Yes, a broken connection is EOF but not leaving a valid file. The cheapest and very popular trick is to have the sender rename it after transmission from a temp name to the right name. If you see the name, it is good.

Some prefer a flag file to say implicitly that it is OK, or send a length or cksum, md5 output for comparison.

If the sender is not cooperating, you can tell that the local writer closed with UNIX 'fuser'.

If the file has structure, that can tell you it is complete, like a trailer or XML element.

It's the kind of question that sells NDM (now an IBM product) and such.
 

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qmail-local(8)                                                System Manager's Manual                                               qmail-local(8)

NAME
qmail-local - deliver or forward a mail message SYNOPSIS
qmail-local [ -nN ] user homedir local dash ext domain sender defaultdelivery DESCRIPTION
qmail-local reads a mail message and delivers it to user by the procedure described in dot-qmail(5). The message's envelope recipient is local@domain. qmail-local records local@domain in a new Delivered-To header field. If exactly the same Delivered-To: local@domain already appears in the header, qmail-local bounces the message, to prevent mail forwarding loops. The message's envelope sender is sender. qmail-local records sender in a new Return-Path header field. homedir is the user's home directory. It must be an absolute directory name. dash and ext identify the .qmaildashext file used by qmail-local; see dot-qmail(5). Normally dash is either empty or a lone hyphen. If it is empty, qmail-local treats a nonexistent .qmailext the same way as an empty .qmailext: namely, following the delivery instructions in defaultdelivery. The standard input for qmail-local must be a seekable file, so that qmail-local can read it more than once. OPTIONS
-n Instead of reading and delivering the message, print a description of the delivery instructions. -N (Default.) Read and deliver the message. EXIT CODES
0 if the delivery is completely successful; nonzero if any delivery instruction failed. Exit code 111 indicates temporary failure. SEE ALSO
dot-qmail(5), envelopes(5), qmail-command(8), qmail-queue(8), qmail-send(8), qmail-lspawn(8) qmail-local(8)
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