I wrote a R package, and installed it. But I don't understand how R can find right help content for object "foo" when calling "help(foo)". Who can give me underlying details or any reference regarding "help(foo)"?
 
In fact, after installing my package "pkg_foo" and calling library(pkg_foo), I can correcttly use any function and data in "pkg_foo". But I can't get help content when I type "?function_foo". My package included the files "CONTENTS", "DESCRIPTION", "INDEX", "TITLE" and subdirectories "DATA", "MAN", "HELP", "R". 
 
I built it in linux system, and install it in windows system. I tried to build it in windows system using "Rcmd build package_foo". System complained: "can't found 'sh', can't found 'tar' and 'gzip'.
 
I appreciate for any advises.
 
Many thanks.
 
Best wishes,
 
Yiming Zhou
 
 


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