shell多个脚本怎么并发执行

#!bin/bash

 

PRONUM=10                #进程个数

 

tmpfile= "$$.fifo"         #临时生成管道文件

mkfifo  $tmpfile

exec  6<>$tmpfile

rm  $tmpfile

 

for (( i=0; i<$PRONUM; i++ ))

do

         echo  "init."

done  >&6

 

for (( i = 0; i < ${count}; i++ ))

do

         read  line

         #echo $line

         {

                 commands

                 echo  "line${i} finished."

         } >&6 &

done  <&6

 

wait

• sh a.sh  & 
  sh b.sh  & 
  sh c.sh &