'/' is a special character in control section; how do I divide?

[John Borwick]

For cfengine 2.1.10, the following deposits "/bin/sh: -c: option 
requires an argument" in /tmp/x.  Why?  What can I do to divide numbers 
in the control section?

control:
        actionsequence = ( editfiles )

    two = ( ExecResult(/bin/sh -c "expr 4/2" ) )

editfiles:
        { /tmp/x
        AppendIfNoSuchLine "$(two)"
        }

--
           John Borwick
       System Administrator
      Wake Forest University | web  http://www.wfu.edu/~borwicjh
      Winston-Salem, NC, USA | GPG key ID             0x797326D5

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