RootDocs is a tiny bash script for launching documentation for ROOT classes.

rootdocs.sh

#!/bin/bash

function bail {
  echo You did not enter a valid ROOT class $1
  exit 1
}

if [ -n "$1" ]; then
  if [ `expr match $1 T` == 1 ]; then
    status_code=`curl -o /dev/null -sIw "%{http_code}" http://root.cern.ch/root/html/$1.html`
    if [ $status_code == 200 ]; then
      firefox http://root.cern.ch/root/html/$1.html
    else bail \(404\)
    fi
  else bail
  fi
else bail
fi

unset status_code

RootDocs is a tiny bash script for launching documentation for ROOT classes. To install it, place it somewhere in your PATH and chmod +x rootdocs.sh. To use it, run rootdocs.sh TTree. An alias, such as alias rd="rootdocs.sh", is handy.

Thank you very much! I love that gist!
If anyone would like to use it with his favorite browser to open the URL, you can try to change "firefox" to "xdg-open".