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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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DIFF(1) 							   User Commands							   DIFF(1)

NAME
slack-diff - compare file contents, modes, etc SYNOPSIS
slack-diff [OPTION]... FILE1 FILE2 DESCRIPTION
A wrapper for diff that displays file modes and other metadata changes. -u -U NUM --unified[=NUM] Tell diff(1) to use unified output format. --diff PROG Use this program for diffing, instead of diff. --fakediff Make a fake diff for file modes and other things that are not file contents. Default is on, can be disabled with --nofakediff. -r --recursive Recursively compare any subdirectories found. -N --new-file Treat missing files as empty. Default is on, can be disabled with --nonew-file. --unidirectional-new-file Treat only missing files in the first directory as empty. --from-file Treat arguments as a list of files from which to read filenames to compare, two lines at a time. -0 --null Use NULLs instead of newlines as the separator in --from-file mode. --devnullhack You have a version of diff that can't deal with -N when not in recursive mode, so we need to feed it /dev/null instead of the miss- ing file. Default is on, can be disabled with --nodevnullhack. --version Output version info. --help Output this help. FILES are `FILE1 FILE2' or `DIR1 DIR2' or `DIR FILE...' or `FILE... DIR'. If --from-file or --to-file is given, there are no restrictions on FILES. If a FILE is `-', read standard input. SEE ALSO
diff(1) diffutils 2.8.1 April 2002 DIFF(1)
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