The kde.sh file says
if ! echo $PATH | grep -q $kdepath; then
This is a bash-specific shellism. It is VITALLY IMPORTANT that
shell startup files do not contain peculiarities of one shell but
are portable shell. My shell for example is a Bourne shell which does
not have the ! builtin (and certainly not anything which acts the
way the above script appears to desire - !ing the entire pipeline).
A portable way to write this would be
if echo "$PATH" | grep -v -q "$kdepath"; then
which would work in any Bourne shell.