linux – 等待子shell进程完成

processUsageFile()
{
    #sdate=`pin_virtual_time  | awk -F" " '{print $3}'`;

    #Get all new files to be loaded to brm staging data.
    count=`ls ${PRE_STAGING}/TWN* 2>/dev/null|grep -v reprocess|wc -l`
    if [ $count -ne 0 ];then
        # Fork subshell
        (./efx_omc_brm_rpt_process.sh -t TWN & )&
        exitOnError
    fi

    #Process Rapid Report files
    count=`ls $PRE_STAGING/RR* 2>/dev/null|grep -v  reprocess|wc -l`
    if [ $count -ne 0 ];then
        (./efx_omc_brm_rpt_process.sh -t RR &)&
        exitOnError
    fi
...
...
}
#Reprocessing. Process the reprocessed files.
#This method updates the records in the BRM staging table.
reprocessingUsageFile()
{
    #Process TWN fulfillment reprocess files
    count=`ls $PRE_STAGING/TWN*reprocess* 2>/dev/null|wc -l`
    if [ $count -ne 0 ];then
        # Fork subshell
        (./efx_omc_brm_rpt_reprocess.sh -t TWN & ) &
    fi

    #Process Rapid Report files
    count=`ls $PRE_STAGING/RR*reprocess* 2>/dev/null|wc -l`
    if [ $count -ne 0 ];then
        (./efx_omc_brm_rpt_reprocess.sh -t RR &) &
    fi
...
...
}

#Pre processing
PreProcessing

# Start processing usage files.
processUsageFile

processErrFile

上述代码的思想是做并行处理.所有方法都调用多个子shell并从tty中分离.我想知道是否有办法等待前两个方法先完成执行然后再运行最后一个方法.

等待PID在某种程度上是不准确的.仍然在尝试…

waitPids() {
echo "Testing $pids -- ${#pids[@]}"
    while [ ${#pids[@]} -ne 0 ]; do
            local range=$(eval echo {0..$((${#pids[@]}-1))})
            local i
            for i in $range; do
                if ! kill -0 ${pids[$i]} 2> /dev/null; then
                    echo "Done -- ${pids[$i]}"
                     unset pids[$i]
                fi
            done
            pids=("${pids[@]}") 
            sleep 1
        done
    }