>>>>> "R" == \"RayZ\" Andrew V Rumm <RayZ> writes:

R> How can i execute?
R> There "Insecure Operation" causes...

 Probably you are running with $SAFE >= 1 and the string is tainted

pigeon% ruby -e '$SAFE = 1; exec "ls".taint'
-e:1:in `exec': Insecure operation - exec (SecurityError)
        from -e:1
pigeon% 

 You must *carefully* untaint the string after *you are sure* that you'll
 not execute something potentially dangerous


Guy Decoux