I was using msysgit and git-bash in cmder when I accidentally exited out of it.
Now I can\'t seem to figure out how to get to the unix environment I previously had.
You can type the full path of your msysgit intallation (2014, Git 1.9.z) to launch a bash session.
For instance:
"c:\prgs\git\PortableGit-1.9.0-preview20140217\Git Bash.vbs": will open a new windows"c:\prgs\git\PortableGit-1.9.0-preview20140217\git-bash.bat": will open a bash session within the current shell.Those two scripts aren't part of folder, and are not found in %PATH%.
As commented by David Grayson and pred below in the comments, using Git-1.9.5-preview20141217.exe does result in an installation (in C:\Program File) which does not have git-bash.bat, and which rely on "Git Bash" shortcut calling C:\Git\bin\sh.exe --login -i.
Don't use that setup. Use the much easier and more complete package PortableGit-1.9.5-preview20141217.7z that you unzip anywhere you want and that you add to your PATH.
Note: with the new Git for Windows releases (2015, Git 2.y.z), that would be:
c:\prgs\git\PortableGit-2.3.5.8-dev-preview-64-bit\git-bash.exe": will open a bash session within the current shell.