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Find time difference between two consecutive lines in same file.

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# 1  
Old 03-11-2011
Question Find time difference between two consecutive lines in same file.

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.:

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:

  cat myfile|gawk '{print $2}'>tempfile
   while read line
    PAST=$line -1 ****** someheting similar here
   echo $line $DIFF

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:

    while read line ;do
     for ((  i = 1 ;  i <= 5;  i++  ))
      PAST${!i}=$line   **********!!!????
   echo $DIFF
  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 09:10 AM..
# 2  
Old 03-11-2011
Your requirment and/or data sample are not very clear, however base you your post I can provide this solution
# cat file
IV 08:09:07
NM 08:12:01
IC 08:12:00
MN 08:14:20
NM 08:14:15

# awk 'function s(x){split($NF,t,":");return t[1]*60^2+t[2]*60+t[3]}{cur=s($NF);if(prev){diff=cur-prev};prev=cur;if(diff<0){print $1" has "diff*-1" second difference on "$NF}}' file
IC has 1 second difference on 08:12:00
NM has 5 second difference on 08:14:15

# 3  
Old 03-11-2011
if you need a plain ksh example of a utility script, you could do the following:-

#timediff - A simple time difference routine
#Requires input of two times (format hh:mm:ss) on command line or will prompt.
#Author:- Robin

if [ $# -eq 2 -o $# -eq 3 ]
   stime=$1                      # Start time
   etime=$2                      # End time
   read stime?"Please enter the start time: "
   read etime?"Please enter the end time: "
   read response?"Respond in hh:mm:ss or seconds? (h/S)"
   typeset -l response
   if [ "$response" = "h" ]
      set - "" "" hh:mm:ss       # Force parm 3 to be hh:mm:ss for later
   echo "The difference is: \c"  # Write a tag just for interactive use

echo $stime|tr ":" " "|read shh smm sss        # Split the time up
echo $etime|tr ":" " "|read ehh emm ess



if [ $delta -lt 0 ]                # Is difference negative, i.e. we're past midnight
   ((delta=$delta+86400))          # Add a day's worth of seconds

if [ "$3" = "hh:mm:ss" ]           # is parm 3 set to request formatted output
   typeset -Z2 dhh dmm dss
   ((dhh=$delta/3600))               # Use integer match to get whole hours
   ((delta=$delta-(3600*$dhh)))  # Take off enough seconds to compensate
   ((dmm=$delta/60))            # use integer matsh to get whole minutes
   ((dss=$delta-(60*$dmm)))  # Take off enough seconds to compensate
   echo "$dhh:$dmm:$dss"
   echo $delta           # Show total seconds difference

It takes either zero, two or three parameters. With zero, it prompts. With two, it gives the difference in seconds. If parameter 3 is hh:mm:ss then it converts it back to time format.

You can then decide how you want your code to call it, for instance a very simple:-

cat myfile |while read label val
   if $preval != "" ]
      echo "$label is after `timediff $preval $val`"

You could, of course add the 3rd parameter to the call to timediff of hh:mm:ss amking the line:
echo "$label is after `timediff $preval $val hh:mm:ss`"

As a warning, I have just thrown this together, so I haven't worried about considering crossing over midnight more than once in a single step.

I hope that this helps, but do let us know if I have missed the point.


Last edited by rbatte1; 03-11-2011 at 11:22 AM.. Reason: Adding comments and a calling loop
# 4  
Old 03-11-2011
Thanks for reply. It is a very elaborate response. I'm eager to try your solutions. Unfortunately all my testing data are at work. I will test your script Monday and I will keep you posted. Thanks again.
# 5  
Old 03-14-2011
MySQL Problem solved

I promised to get back with results.
The danmero solution is working charmingly, although I'm not fully understand how it read previous line and compare with current one. The data from my file are several lines long and script pointed me exactly where to look for differences. Thanks again danmero, this is exactly what I need.
Although is not exactly what I intended to obtain, I tested the rbatte1 solution and after choosing h or S option I get an error:

Please enter the start time: 08:09:10
Please enter the end time: 08:09:20
Respond in hh:mm:ss or seconds? (h/S)S
The difference is: ./rba[26]: shhs=*3600: unexpected `*'
./rba[27]: ehhs=*3600: unexpected `*'
./rba[28]: smms=*60: unexpected `*'
./rba[29]: emms=*60: unexpected `*'

Probably becouse i use bash which i must be mentioned earlyer. Sorry.
Thanks again for your time. My problem was solved Smilie
# 6  
Old 03-14-2011
Ahh. I wrote for ksh. What input did you supply? I will have a go at converting.
# 7  
Old 03-14-2011
The input was hh:mm:ss format.
In this case the start time was 08:09:10 and the end time was 08:09:20

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