Question

How to detect file transfer is complete?

Asked by: gchen91789

Hi experts,

I have a script try to concatenate 10 file into one file, the question is how to detect all the files were transfer completed.

Some time the file is in the middle of transfer process, and the script try to concatenate them and give me error.

I have try use e and r to detect the file existing, but it did not work.

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Asked On
2008-02-14 at 11:01:45ID23163968
Topic

Unix Systems Programming

Participating Experts
2
Points
500
Comments
4

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Answers

 

by: omarfaridPosted on 2008-02-14 at 11:11:25ID: 20896171

How files are transfered?

Unix commands usually exit with status 0 if successful.

The exit status of command is set in env variable $?

You may

echo  $?

$? can be used to check if files were transfered successfully

 

by: stefan73Posted on 2008-03-11 at 15:23:50ID: 21101007

Hello gchen91789,

You don't have any indication if a transfer is complete - that's typical for FTP or so. There are several ways:

(unrealiable)
You can see if a file has not been written for some time: "find . -mtime +1" will find files which are older than 1 minute.

(better)
Transferred files should be marked as complete, e.g., like this:
File is tranferred as "file.incomplete" and renamed to "file.complete" after transfer. Then you only concatenate *.complete.

Be careful though: If you later do "rm -f *.complete", you might catch files which have become completed while you concatenated the rest. Better first use mv to move the files into a subdirectory, concatenate them there and then you can also delete them (or do any further processing).

Regards,

stefan73

20120131-EE-VQP-002

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