I installed kde4 on my FreeBSD machine,
Started kde4 by putting following line in ~/.xinitrc

exec /usr/local/kde4/bin/startkde

But unable to use knosole when tried to open it

To overcome this problem please try out following steps

Press ALT+F2 {Itwill enable you to run a command}
Enter `konsole -e csh` {-e option will execute a command instead of shell}
konsole can be seen running now. now we need to change the setting of shell profile, to do so
Settings -> Change Profile -> Shell
Then
Settings -> Edit Current Profile
Here we need to change the value of command
I changed /bin/sh to /bin/csh
then closed the window and using ALT+F2 given a command `konsole`
now you can see konsole