Here is my scenario:
I have a directory I want to run rake commands.
I install ruby 1.9.3.
I open a new command window in the default location of C:/Users/Administrator
I run ruby -v and get the response ruby 1.9.3p551 (2014-11-13) [i386-mingw32]
This is all good.
I browse to a folder and open a command window in that directory: C:/agent
I run ruby -v and get the response ruby is not recognized as an internal or external command...
Ruby is installed here: C:\Ruby193\bin and this is in my %PATH%
Further when I run PATH from command line I get this:
PATH=C:\Ruby26-x64\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C :\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\dotnet\;C:\Program F iles\Microsoft SQL Server\130\Tools\Binn\;C:\Program Files\Microsoft SQL Server\ Client SDK\ODBC\170\Tools\Binn\
But my environment system variables show this: C:\Ruby193\bin;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;%SYSTEMROOT%\System32\WindowsPowerShell\v1.0\;C:\Program Files\dotnet\;C:\Program Files\Microsoft SQL Server\130\Tools\Binn\;C:\Program Files\Microsoft SQL Server\Client SDK\ODBC\170\Tools\Binn\;
WHy would they be different? This is why ruby works in one directory and not another, I presume
A full system restart fixed my path problem and as a result - no more ruby errors.