make automatic variables

http://www.gnu.org/software/make/manual/make.html#Automatic-Variables

take a look at the code of a s4 method

getMethod('sampling', signature='s4class')

linux search manual

apropos 

for example

# apropos open 

ap·ro·pos

 prep \ˌa-prə-ˈpō, ˈa-prə-ˌ\

trace files accessed

using strace on linux 

what is fs_usage on mac?

git status -uno

  git status -uno

R machine related limits & numbers

?.Machines 

sample.int(.Machine$integer.max, 1)

R's memory limits

?"Memory-limits"