I found that I have the below error when I was installing the Unleashed Multi-Site Manager on CentOS6.
./support_files/GetApachePid.sh: ./support_files/GetApachePid.sh: Input/Output error
./support_files/GetFMTomcatPid.sh: ./support_files/GetFMTomcatPid.sh: Input/Output error
./support_files/GetFMMySQLPid.sh: ./support_files/GetFMMySQLPid.sh: Input/Output error