how to measure time in linux?

how to measure time in linux?

References

Reference NO 1

http://stackoverflow.com/questions/2150291/how-do-i-measure-a-time-interval-in-c

Reference NO 2

http://linux.die.net/man/7/time

Reference NO 3

http://superuser.com/questions/228801/measure-script-execution-time

Reference NO 4

http://aufather.wordpress.com/2010/09/08/high-performance-time-measuremen-in-linux/

Reference NO 5

http://nadeausoftware.com/articles/2012/04/c_c_tip_how_measure_elapsed_real_time_benchmarking

Reference NO 6

http://webtools.live2support.com/linux/time.php

Reference NO 7

http://www.linuxjournal.com/content/use-date-command-measure-elapsed-time

Reference NO 8

http://linux.about.com/od/commands/a/Example-Uses-Of-The-Command-Time.htm