title: Where should I set the variable PATH in R?
body: <p>I constantly need to call Tex Live binaries for compilation in R. However after the upgrade of Tex Live distribution, the path to current binaries needed to updated manually in the <code>PATH</code>(<code>Sys.getenv("PATH")</code>) variable. </p>
  
  <p>As a single user on a Ubuntu system, which file should I update the value in, so that R gets the <code>PATH</code> correctly irrespective of whichever directory R is launched from.</p>
  
  <p>One point I still don't gather is from where does <code>R</code> gets its site-wide (I mean for all users, even if faulty in saying so) <code>PATH</code> variable set, because no such variable name as "PATH" occur inside any files (Renviron, Renviron.site, Rprofile.site) in either of "R_HOME/etc/" and user's home directory? I also haven't set <code>Sys.getenv("R_ENVIRON")</code> and <code>Sys.getenv("R_ENVIRON_USER")</code> values.</p>
  
  <p>I'd appreciate anybody's input here.</p>