What is the ksh script for cycling log files?

cycle_logs()
{
        logf=$1
        print_msg "Cycling log file ${logf}"
        loop=9
        rm ${logf}.$loop > /dev/null
        while [[ $loop > 1 ]]
        do
                (( loop2 = $loop - 1 ))
                mv ${logf}.${loop2} ${logf}.${loop}
                (( loop = $loop - 1 ))
        done
        mv ${logf} ${logf}.1
}

cycle_logs() { logf=$1 print_msg "Cycling log file ${logf}" loop=9 rm ${logf}.$loop > /dev/null while [[ $loop > 1 ]] do (( loop2 = $loop - 1 )) mv ${logf}.${loop2} ${logf}.${loop} (( loop = $loop - 1 )) done mv ${logf} ${logf}.1 }