The file kde.csh has several defects. If I'm a user and
attempt to login to my machine, the sourcing of kde.csh will
fail...

list of bugs
[1] didn't use 'set' when specifying 'kdepath'
[2] final 'if...then' doesn't check exit status, instead
checks output of command 'echo $path | grep -q
$kdepath'..need to look at exit status by either using {}
around command or via the $status variable

Here is a script with the issues fixed...just do a diff with
original to see problems...
-----------

# KDE initialization script (csh)
if ( $?KDEDIR ) then
         if ( $KDEDIR == "/usr" ) then
         exit
         endif
endif
setenv KDEDIR /usr
set kdepath="${KDEDIR}/bin"

echo $path | grep $kdepath > /dev/null
if ( $status ) then
 exit
endif

setenv PATH "${kdepath}:${PATH}"