FOR A C-SHELL

....

# for passcal 
setenv PASSCAL /opt/passcal
setenv PASSOFT ${PASSCAL}
set path=(${PASSCAL}/bin ${PASSCAL}/other/bin $path)
setenv MANPATH ${PASSCAL}/man:${MANPATH}
......


FOR A BASH SHELL

.....
export PASSCAL=/opt/passcal
export PASSOFT=${PASSCAL}
export PATH=${PASSCAL}/bin:${PASSCAL}/other/bin:${PATH}
export MANPATH=${PASSCAL}/man:${MANPATH}