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Old 12-16-2004, 09:43 AM   #1
Ephracis
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Registered: Sep 2004
Location: Sweden
Distribution: Ubuntu, Debian
Posts: 1,109

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Calculate in shell script


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?
 
Old 12-16-2004, 11:11 AM   #2
homey
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Registered: Oct 2003
Posts: 3,057

Rep: Reputation: 56
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
 
  


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