Shell Script to Get The Time Difference

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Shell Script to Get The Time Difference

I was trying to estimate what is the time spent for a curl command.
So I made a simple shell script for this.

First
create a script name timediff.sh

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$ vim timediff.sh

Second
Append text as follows:

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#!/bin/bash
echo "==========START=========="
date
START=$(date +%s%3N) # %3N means in miliseconds
# Start your script work here
echo "processing..."
sleep 2 # sleep for 2 seconds.
# End
END=$(date +%s%3N)
echo
echo "==========END============"
date
DIFF=$(( $END - $START ))
echo "It took $DIFF ms."

Third
Save and execute the following script:

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$ chmod +x timediff.sh

Finally
Execute the script:

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$ ./timediff.sh

Output:

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==========START==========
二 10月 27 09:32:50 UTC 2015
processing...
==========END==========
二 10月 27 09:32:52 UTC 2015
It took 2002 ms.