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If you don't mind a bit of delay, there's a much simpler way: Check if the file's been modified in the last 10 minutes. This won't tell you if the connection broke and left an incomplete file, but...

One caveat is that the file might not be wholly received to set the modify time or change checksum or hash. Nice file transmitters have some way to signal a good transfer, like an ack file or name...

Crontab this script before time of earliest arrival:#!/usr/bin/ksh

touch /tmp/fmind.mark

while [ 1 ]
do
find your_file -newer /tmp/fmind.mark | read f
if [ "$f" != "" ]
then
...

In sh: Tweak F to your needs. A bit quick but it should work

#!/bin/sh

F='/path/to/that/certain/file'
MD5='/tmp/md5ofthatcertainfile'

[ "$(md5sum "$F")" = "$(cat "$MD5" 2>/dev/null)" ] || {...