This plugin is similar to the time command in Unix
No backgrounding however

Plugin Name: Time
Authors: Qiuchan Wang, Hunter Morgan

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Functionality: Shows duration of execution of a particular command in real and system time (in seconds.microsecs)

Usuage:
	//Precede any command by the word time :

esh> time sleep 1

	// When the command completes time reports how long it took to execute
	// in terms of Real, User CPU and System CPU time

real	1.001s
system	0.000s

esh>

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Note on time from our friend Wikipedia:
 == A program may spend some time waiting and not executing at all (whether in user mode or system mode) the real time may be greater than the total CPU time.

 == A program may fork children whose CPU times (both user and sys) are ADDED to the values reported by the time command, BUT on a multicore system these tasks are run in parallel, the total CPU time may be greater than the real time.