Calculate in shell script

Ephracis · 12-16-2004, 09:43 AM

I have a shell script with a variable that is set to "date +%s" and I have the timestamp of a file.

Now I want the script to calculate now-timestamp and then use the modulus (%) to calc the time elapsed. Like this:

Code:

NOW=`date +%s`
TS=1102922460
tmp = now-ts

s = tmp%60
tmp -= s
tmp /= 60

m = tmp%60
tmp -= m
tmp /= 60

h = tmp%24
tmp -= h
tmp /= 24

days = tmp

echo elapsed $days days, $h:$m:$s

How can I calc this in a shell script?

homey · 12-16-2004, 11:11 AM

I hope this isn't too far off the wall as I haven't tested the calcs.

Code:

#!/bin/bash
 
now=`date +%s`
ts=1102922460
tmp=$(($now - $ts))

s=$(($tmp %60))
tmp=$(($tmp - $s))
tmp=$(($tmp / 60))

m=$(($tmp %60))
tmp=$(($tmp - $m))
tmp=$(($tmp / 60))

h=$(($tmp %24))
tmp=$(($tmp - $h))
tmp=$(($tmp / 24))

days=$tmp

echo elapsed $days days, $h:$m:$s