Find execution time of script

Shell Programming and Scripting
1

i am using bash

 
START=$(date +%s)
 

 END=$(date +%s)
 
 
DIFF=$(echo "$END - $START" )

this code is not working

2

Please try a search of the forum prior to submitting questions.

3

those methods are notr working

4

Your answer does not help at all! What do you mean by "not working".

Can you be more specific? Post what all issues that you are facing.

5

You need to calculate the difference of the two numbers, not simply print them.

i.e.

DIFF=$((END - START))

exactly as shown in the post linked to by joeyg.

Which OS are you using?

6

t_1.sh


START=$(date +%s)


 END=$(date +%s)


DIFF=$(echo "$END - $START" )
echo $DIFF

i execute the t_1.sh
and getting the output as %s - %s

7

If you're using Solaris, %s does not work. You can try Perl:

START=$(perl -e 'print time();')
8

i dont want to use perl only shell scripting

9

The date command is an external command, just like Perl, and has nothing to do with the shell. date doesn't support %s, so you don't have a choice.

Search the web for "Solaris epoch time", and you will find other alternatives - none of them using the date command.

1 Like
10

Thanks a ton buddy. :slight_smile:

but when i ran your command

START=$(perl -e 'print time();')
 echo $START
1372858724---o/p

how to find the difference in 2 date

11 
DIFF=$((END - START))
12

it is not working


START=$(perl -e 'print time();')
 echo $START

sleep 10
END=$(perl -e 'print time();')
 echo $END

 
 DIFF=$((END - START))
 
  echo $DIFF

outp is only
1373272541
1373272552

13

Try running your script with:

/usr/xpg4/bin/sh yourscript
14

You may try changing

DIFF=$((END - START))

to

DIFF=$(expr $END - $START)
15

Hi,

You can use $SECONDS parameters instead of date command.

start=$SECONDS
............
..........
...............
end=$SECONDS

echo "Calculation Duration: $((end - start)) secs."

Regards,
Goksel Yangin
Computer Engineer

1 Like