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Top Forums Shell Programming and Scripting Grep from file modified one minute ago Post 302976853 by bakunin on Thursday 7th of July 2016 07:15:27 AM
Old 07-07-2016
You haven't said what you need that for, but i suppose you want to process "incoming" files somehow and want to prevent processing them twice.

In this case, wouldn't it be easier to move the files once they are processed? You wouldn't need to diddle with time stamps and complicated calculations and could adapt something like the following (sketch)

Two directories: /some/where/incoming and /some/where/processed, files go into "incoming"

Code:
while : ; do
     ls /some/where/incoming | while read FILE ; do
          process_file $FILE
          mv $FILE /some/where/processed
     done
     sleep 5
done

I hope this helps.

bakunin
 

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ENC(4)							   BSD Kernel Interfaces Manual 						    ENC(4)

NAME
enc -- Encapsulating Interface SYNOPSIS
To compile this driver into the kernel, place the following line in your kernel configuration file: device enc DESCRIPTION
The enc interface is a software loopback mechanism that allows hosts or firewalls to filter ipsec(4) traffic using any firewall package that hooks in via the pfil(9) framework. The enc interface allows an administrator to see incoming and outgoing packets before and after they will be or have been processed by ipsec(4) via tcpdump(1). The ``enc0'' interface inherits all IPsec traffic. Thus all IPsec traffic can be filtered based on ``enc0'', and all IPsec traffic could be seen by invoking tcpdump(1) on the ``enc0'' interface. What can be seen with tcpdump(1) and what will be passed on to the firewalls via the pfil(9) framework can be independently controlled using the following sysctl(8) variables: Name Defaults Suggested net.enc.out.ipsec_bpf_mask 0x00000003 0x00000001 net.enc.out.ipsec_filter_mask 0x00000001 0x00000001 net.enc.in.ipsec_bpf_mask 0x00000001 0x00000002 net.enc.in.ipsec_filter_mask 0x00000001 0x00000002 For the incoming path a value of 0x1 means ``before stripping off the outer header'' and 0x2 means ``after stripping off the outer header''. For the outgoing path 0x1 means ``with only the inner header'' and 0x2 means ``with outer and inner headers''. incoming path |------| ---- IPsec processing ---- (before) ---- (after) ----> | | | Host | <--- IPsec processing ---- (after) ----- (before) ---- | | outgoing path |------| Most people will want to run with the suggested defaults for ipsec_filter_mask and rely on the security policy database for the outer head- ers. EXAMPLES
To see the packets the processed via ipsec(4), adjust the sysctl(8) variables according to your need and run: tcpdump -i enc0 SEE ALSO
tcpdump(1), bpf(4), ipf(4), ipfw(4), ipsec(4), pf(4), tcpdump(8) BSD
November 28, 2007 BSD
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