go('myprog') # will run source('myprog.r')
go() # will run source('myprog.r') again
go('somelib',add=TRUE) # will run source('myprog.r') and source('somelib.r')
go('myprog','somelib') # same as above
go('mytest') # will run source('mytest') only
go() # runs source('mytest') again
G # short cut to call go()
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