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How to calculate time difference between start and end time of a process!

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Top Forums Shell Programming and Scripting How to calculate time difference between start and end time of a process!
# 1  
Old 09-02-2010
How to calculate time difference between start and end time of a process!
Hello All,

I have a problem calculating the time difference between start and end timings...!

the timings are given by 24hr format..

Start Date : 08/05/10 12:55
End Date : 08/09/10 06:50

above values are in mm/dd/yy hh:mm format.

Now the thing is, 7th(08/07/10) and 8th (08/08/10) of August are saturday and Sunday. So I dont want those timings( i mean saturday and sunday- script should check for weekends and should not count the timings for weekends). Finally i need the output in hr format which is the difference between start and end timings excluding weekends.

can anybody help me in this.

Thank you.
# 2  
Old 09-02-2010
With GNU date
Code:
#!/bin/bash
StartDate="08/05/10 12:55"
EndDate="08/09/10 06:50"
HRS=$((($(date -d "$EndDate" +%s)-$(date -d "$StartDate" +%s))/3600))
WHRS=$HRS
for (( D=1; D<$((HRS/24+1)); D++ ))
do
   [ $(date -d "$StartDate $D days" +%u) -ge 6 ] && ((WHRS-=24))
done
echo "Working time elapsed='$WHRS'"

As a function
Code:
#!/bin/bash
Elapsed()	{
   HRS=$((($(date -d "$2" +%s)-$(date -d "$1" +%s))/3600))
   WHRS=$HRS
   for (( D=1; D<$((HRS/24+1)); D++ ))
   do
      [ $(date -d "$1 $D days" +%u) -ge 6 ] && ((WHRS-=24))
   done
   echo $WHRS
}
StartDate="08/05/10 12:55"
EndDate="08/09/10 06:50"
echo "Working time elapsed='$(Elapsed "$StartDate" "$EndDate")'"

# 3  
Old 09-02-2010
frans,

Thanks for your reply.

But its not working for me.. I am not that good at shell scripting.. I am a beginner in this.

at first when i run that function script i got the below error..

Code:
interpreter "usr/bin/bash" not found
interpreter "usr/bin/bash" not found
interpreter "usr/bin/bash" not found

later i deleted the first line i,e #!/bin/bash and then it gave the below error

Code:
syntax error at line 4 : `((' unexpected

pls tell me where i went wrong.

Thank you,.

---------- Post updated at 10:06 AM ---------- Previous update was at 10:04 AM ----------

and also for date -d it'll give illegal option -d
# 4  
Old 09-02-2010
What OS are you running ?
# 5  
Old 09-02-2010
Do you need it in HHMMSS format?

If not, you can check the environment variable called: ${SECONDS}
Code:
startTime=${SECONDS}
# Do some stuff here
endTime=${SECONDS}
diffTime=`expr ${endTime} - ${startTime}`
echo "Diff Time: [${diffTime}]"

# 6  
Old 09-02-2010
time {application name goes here}

the real time is the time that the process was running
# 7  
Old 09-02-2010
I do not have GNU date. So I got frustrated with limited options to get elapsed time in Unix,, I wrote a method in Java and using it..
If this works I could replace java method with this..

Code:
diffTime=`expr ${endTime} - ${startTime}`

Does this approach work if a main program is calling say 1. common functions included from other ksh programs and 2. included java programs(from jar/class) ? I know PID is same thrughout the execution of my program.

In other words can we use this to reliably find elapsed time to execute complex Admin scripts in Unix ?

say my environment variable is this
Quote:
SECONDS=1111
: once I execute abc.sh Does it start incrementing SECONDS as soon as any PID starts in the runtime and ends incrimenting before that PID exits from shell !?
Last edited by kchinnam; 09-03-2010 at 12:03 AM.. Reason: more doubts..
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