Problems with installing Xcode on Mac 10.10.5 ( Locations - setting)
The linked picture in the install guide



is simply wrong. After installing the latest Xcode 7.1.1 the command line tools version is indeed Xcode 7.1.1 (7B1005).

jot is an executable (it prints sequential or random data) residing in /usr/bin. The purpose of executing jot - 1 25 is to ensure that the $PATH variable is set properly in your environment. If it can't be executed your $PATH variable probably doesn't include /usr/bin.

To get your current $PATH variable enter echo $PATH. The default $PATH in Yosemite looks like this:

/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin


To restore the proper $PATH variable use one of the various answers here at apple.stackexchange.com.