[Solved] Change Upper case to Lower case in C shell

Is there a command that can switch a character variable from UPPER case to lower case?
like

foreach AC ( ABC BCD PLL QIO)
     set ac `COMMAND($AC)`
...
end

Thanks a lot!

Yes...
the command tr

Thanks vbe!

set ac `echo $AC | tr "[:upper:]" "[:lower:]"`

does the job well

You welcome!