If you create a directory to work in for your project you could store that
and use that later
maindir<-getwd()
#then even if you change directories for different parts of your project
(but remain inside that folder)
you could put maindir variable into the path of the dir command. The less
directories you have to scan through, the faster your answer.
dir(maindir, pattern="foo.pdf", full.names=T, ignore.case=T, recursive=T)
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