CODEWITHSUNDEEP
bashshell
GaZ
GaZ

Reputation: 2406

Calculate the difference between two times (including millseconds) in bash

I have a simple bash script which outputs two timestamps per line like so:

10:25:48,192 10:25:46,967
10:25:48,522 10:25:48,200
10:25:49,418 10:25:48,531

I'd like to refine the script to calculate the difference (in milliseconds) between the two timestamps on each line. How can this be done?

Upvotes: 1

Views: 781

Answers (1)

Cyrus
Cyrus

Reputation: 88553

#!/bin/bash

declare -i d1 d2 diff    # set integer flag

while IFS=":, " read -r h1 m1 s1 x1 h2 m2 s2 x2; do
  # force decimal numbers without leading zeros and calculate milliseconds
  d1=$((10#$h1))*60*60*1000+$((10#$m1))*60*1000+$((10#$s1))*1000+$((10#$x1))
  d2=$((10#$h2))*60*60*1000+$((10#$m2))*60*1000+$((10#$s2))*1000+$((10#$x2))
  diff=$d1-$d2
  echo $diff
done < file

Output:

1225
322
887

With awk:

awk -F '[:, ]' '{print ($1*60*60*1000+$2*60*1000+$3*1000+$4)-($5*60*60*1000+$6*60*1000+$7*1000+$8)}' file

Upvotes: 3

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