Can't seem to install e2fsprogs properly
Usually brew executables (except brew itself) are linked to /usr/local/bin/ which is in the PATH already.

Since e2fsprogs executables are also installed to a subsequent sbin folder, force linking them with brew ln --force e2fsprogs will create a new folder /usr/local/sbin which contains the links to the sbins.

This new folder is not in the PATH. Simply add or extend an already existing  line 

export PATH=/usr/local/sbin:$PATH


in ~/.bash_profile.

To update PATH in your current Terminal session immediately, simply enter:

source ~/.bash_profile


Or close your Terminal window and open a new one.