dput() and dget()The easiest way to share a (preferable small) data frame is to use a basic function dput(). It will export an R object in a plain text form.
Note: Before making the example data below, make sure you're in an empty folder you can write to. Run getwd() and read ?setwd if you need to change folders.
dput(mtcars, file = 'df.txt')
Then, anyone can load the precise R object to their GlobalEnvironment using the dget() function.
df <- dget('df.txt')
For larger R objects, there are a number of ways of saving them reproducibly. See Input and output .