UNIX for Dummies Questions & Answers

#!/usr/bin/ksh

while read DATE CDE START FINISH JUNK
do
    SDATE=$(printf '%(%s)T' "$DATE $START")
    FDATE=$(printf '%(%s)T' "$DATE $FINISH")
    printf "%s  %s  %s  %s  %d Secs\n" $DATE $CDE $START $FINISH  $((FDATE-SDATE))
done < datafile

#!/bin/ksh
 
IFS="$IFS:"
 
while read d x h m s h2 m2 s2 y
 do
  (( t = ( ( h2 - h ) * 60 + m2 - m ) * 60 + s2 - s ))
 
  while (( t < 0 ))
   do
    (( t =+ 86400 ))
   done
 
  export t0=
 
  while (( t > 60 ))
   do
    to=$( printf "$to:%2.2d" $(( t % 60 )) )
    t=$(( t / 60 ))
   done
 
  echo "$d   $x   $h:$m:$s    $h2:$m2:$s2    $t$to"
 done