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Top Forums Shell Programming and Scripting Find time difference between two consecutive lines in same file. Post 302503602 by vilibit on Friday 11th of March 2011 04:14:00 AM
Old 03-11-2011
Question Find time difference between two consecutive lines in same file.

Hello
I have a file in following format:

IV 08:09:07
NM 08:12:01
IC 08:12:00
MN 08:14:20
NM 08:14:15

I need a script to compare time on each line with previous line and show the inconsecutive line. Ex.:
08:12:00
08:14:15

A better way will be a message in this form:
“IC has 1 second difference on 08:12:00 time
NM has 5 second difference on 08:14:15 time”
But first example will be more than enough.

How i can compare each line whit previews line? I tried this script:

Code:
 
  cat myfile|gawk '{print $2}'>tempfile
   while read line
    do
    PAST=$line -1 ****** someheting similar here
    DIFF=$(($PAST-$LINE))
   echo $line $DIFF
  done<tempfile

but it doesn’t work in line 3. Is a syntax problem or is an impossible command. I don’t know. I’m new in this. I even try to make a variable name, variable but again I’m stuck in line 3 on syntax or in “impossibliness” problem:


Code:
    while read line ;do
     for ((  i = 1 ;  i <= 5;  i++  ))
      PAST${!i}=$line   **********!!!????
      DIFF=$(($PAST${!i}-$(($PAST${!i-1}))
   echo $DIFF
   done
  done < tempfile

It must be an “eval” expression somewhere but “indirect variable reference” is way over my head right now. I have a felling that all can be done very easily but I can’t see how Smilie.
Thanks in advance for your time.

Last edited by vilibit; 03-11-2011 at 08:10 AM..
 

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IPTABLES-XML(1) 						  iptables 1.4.21						   IPTABLES-XML(1)

NAME
iptables-xml -- Convert iptables-save format to XML SYNOPSIS
iptables-xml [-c] [-v] DESCRIPTION
iptables-xml is used to convert the output of iptables-save into an easily manipulatable XML format to STDOUT. Use I/O-redirection pro- vided by your shell to write to a file. -c, --combine combine consecutive rules with the same matches but different targets. iptables does not currently support more than one target per match, so this simulates that by collecting the targets from consecutive iptables rules into one action tag, but only when the rule matches are identical. Terminating actions like RETURN, DROP, ACCEPT and QUEUE are not combined with subsequent targets. -v, --verbose Output xml comments containing the iptables line from which the XML is derived iptables-xml does a mechanistic conversion to a very expressive xml format; the only semantic considerations are for -g and -j targets in order to discriminate between <call> <goto> and <nane-of-target> as it helps xml processing scripts if they can tell the difference between a target like SNAT and another chain. Some sample output is: <iptables-rules> <table name="mangle"> <chain name="PREROUTING" policy="ACCEPT" packet-count="63436" byte-count="7137573"> <rule> <conditions> <match> <p>tcp</p> </match> <tcp> <sport>8443</sport> </tcp> </conditions> <actions> <call> <check_ip/> </call> <ACCEPT/> </actions> </rule> </chain> </table> </iptables-rules> Conversion from XML to iptables-save format may be done using the iptables.xslt script and xsltproc, or a custom program using libxsltproc or similar; in this fashion: xsltproc iptables.xslt my-iptables.xml | iptables-restore BUGS
None known as of iptables-1.3.7 release AUTHOR
Sam Liddicott <azez@ufomechanic.net> SEE ALSO
iptables-save(8), iptables-restore(8), iptables(8) iptables 1.4.21 IPTABLES-XML(1)
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