GitHub recently launched a more powerful search feature which has been used on more than one occasion to identify sensitive files that may be hosted in a public GitHub repository. When used innocently, there are all sorts of fun things you can find with this search feature.

Inspired by Aldo Cortesi's post documenting his exploration of public shell history files posted to GitHub, I was curious if there were any such .Rhistory files. For the uninitiated, .Rhistory files are just logs of commands entered into the interactive console during an R session. Some recent IDEs, such as RStudio, automatically create these files as you work. By default, these files would be excluded from a Git repository, but users could, for whatever reason, choose to include their .Rhistory files in the repository.

Using this search function, combined with the Python script Mr. Cortesi had put together to download the files associated with a GitHub search, I was able to download 638 .Rhistory files from public GitHub repositories (excluding forks). What follows is an exploration of those files.

Load Data

Trimming out the 0-line .Rhistory files leaves us with a total of 531 non-empty files, totaling 157265 commands entered into R.

First, I was curious about the length of these files.

 

 

It seems that many of these files represent very brief (and likely unpleasant) interaction with R. For instance:

exit
exit
ls
exit

(if you're out there, you were likely looking for the 'q()' command). Others represent quite extensive projects; the maximum was 7268 lines long.

Package Usage

More interesting to me was how these users were using R – what the details contained in these history files represent in terms of the user's interaction with R. For starters, which packages were the users using? We can identify packages loaded via the library() or require() functions.

There were 3068 such calls to load packages in the scripts. The top 10 packages loaded in this set were:

Package Name	Count
ggplot2	291
plyr	81
GREBase	59
xtable	59
reshape	52
reshape2	48
devtools	43
igraph	41
RGreenplum	40
lattice	39

(Of course it's likely worth noting the selection bias from examining only R commands which were included in GitHub projects. I would imagine that the usage for devtools, for instance, is certainly inflated among GitHub projects over the general populace.)

Function Use

I was also curious which functions were most widely executed. We can get a rough identification of most function names by looking for a sequence of valid characters followed by an ( symbol.

This gives us a total of 100190 function calls of 8028 unique function names. The 20 most popular functions executed in this set were:

Function Name	Count
source	5191
plot	2552
c	2448
library	2416
function	1711
for	1138
summary	1107
if	1062
read.csv	955
rep	887
length	880
head	828
lm	766
sum	753
View	722
print	661
install.packages	648
mean	606
setwd	569
names	562

It should also be possible to identify for which functions the help/manual pages were viewed by identifying lines beginning with a “?” or arguments inside of a call to help().

I can identify 2409 requests for help on 1101 different function names. The top 10 most prevalent functions for which users request help follow.

Function Name	Count
plot	43
hist	31
lm	25
writePage	24
order	20
sort	20
cor	17
apply	16
read.csv	16
matrix	15

Conclusion

Of course, there are all sorts of different types of analysis one could perform on this dataset. Post any suggestions you have in the comments; I imagine there's at least one more post of interesting finds in this data. Check out the source code on GitHub.