Shell script concurrency

#!/bin/bash# filename: bingfa.sh# time: 2016/03/9 18:59:05ip= ' Cat /tmp/iplist '            #  Filter Server ipdir= '/tmp '                  #  Target Path                                   thead_num=10                #  custom concurrency number, depending on the performance of the server or the application to adjust the size, start not to define too large, Avoid management downtime tmp_fifo_file= "/tmp/$$.fifo"        #  name the pipe file with the process ID number mkfifo $ tmp_fifo_file          #  creating a temporary pipeline file exec 4<>$ tmp_fifo_file          #  Open the Tmp_fifo_file pipeline file in read-write mode, The file descriptor is 4, or you can take 3-9 arbitrary descriptor rm -f  $tmp_fifo_file          #  Delete a temporary pipeline file, or you can delete for  (i=0;i < $thead _num;i++)); do    #  use the For loop to enter the number of concurrent lines in the pipeline   echo  ""                 #  Output blank line done > &4                 #   output redirect to the defined file descriptor 4 #  The real command to execute all the commands in the following curly braces for i in  $ip; do            #  cycle all servers to be executed   read -u4                #  reads rows from the pipeline, each row, after all rows have been read, execution hangs until the pipeline has idle rows     {                  #  curly braces are all the commands to execute      echo  $i              #  Display host ip      scp $1  $i: $dir    &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;#&NBSP;SCP is a simple instance where a script is executed to pass in a variable value, replacing any other command and command group       ssh  $i  -n  ' Date '        #  print time       sleep 3            #  pause for 3 seconds, Buffer time to the system, limit the number of concurrent processes      echo  ""  >&4           #  writes a blank line so that the pending loop continues to execute     }&                  #  into the background to execute donewait                    #   Wait for all background processes to complete exec 4>&-                 #&nbSP; Delete file descriptor exit 0 

SH Bingfa.sh/tmp/test.txt # Execute script

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Shell script concurrency