UNIX -Tracking File I/O

UNIX for Beginners Q & A
1

Hi Team,

I have a requirement. We are processing 100s of thousands of files and had to tar 10K files each

The problem I face is, I would need to add the file into tar only when the write operation in the file is complete. How would I achieve this.

OS : Sun Solaris 5.8
Shell : KSH

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2

Are these files created/written for a set time? For example, 5 minute logs? If so, you could select only files which are greater than 5 minutes old.

Please elaborate on the scenario with regards to these files time frames.

3

The file is not getting generated on a fixed time unfortunately

4

Okay, so how are they being created???

5

Are files created, written to, and then permanently closed? Or could they be reopened?

6

Hi,

The files are created by another process. The file write once complete, it will not be re-opened again.

7

The fuser command lists the opening processes. If nothing is listed then the file is not opened.
Example shell script:

pids=`fuser filename 2>/dev/null`
if [ -z "$pids" ]
then
  echo "not opened"
fi
8

The fuser command requires the sys_mount privilege. So while using fuser is a great, answer you need advanced privilege for the process running it.