IP network address and broadcast address calculation for shell scripts

This is an old-fashioned exercise, shell script to practice a lot, want to practice shift calculation, there is the following script.

#!/bin/bashippattern= "(\< ([0-9]|[ 1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5]) \>\.) {3}\< ([0-9]|[ 1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5]) \> "maskpattern=" [1-9]| [12] [0-9]|3[01] "while :d o  echo -e -n " Please input a legal ip  address [such as 192.168.1.1/16]:  "  read userInput     ipmask= ' echo  $userInput  | egrep  "$IPPattern/$maskPattern" '     # such as 192.168.1.1/24  if [ -z  "$IPMask"  ] ;then     echo  "PLEASE&NBSP;INPUT&NBSP;THE&NBSP;RIGHT&NBSP;FORMAT.&NBSP;[SUCH&NBSP;AS&NBSP;192.168.1.1/ 1-31]  "    continue  fi    ipaddr= ' echo  $IPMask  | cut -d/ -f1 '   iptype[1]= ' echo  $IPAddr  | cut -d. -f1 '   iptype[2]= ' echo  $IPAddr  | cut -d.&nBsp;-f2 '   iptype[3]= ' echo  $IPAddr  | cut -d. -f3 '   iptype[4]= ' echo   $IPAddr  | cut -d. -f4 '   mask= ' echo  $IPMask  | cut -d/  -f2 '   echo  ' ip address is ${iptype[1]}*${iptype[2]}*${iptype[3]}*${iptype[ 4]} , mask is  $mask  . "      ((iphex[1]=iptype[1]<<24))    ((iphex[2]=iptype[2]<<16))     ((iphex[3]=iptype[3]<<8))    ((iphex[4]=iptype[4))      #192  c0  ; 1 1 1   ((Iph=${iphex[1]}+${iphex[2]}+${iphex[3]}+${iphex[4]})   # echo  $iph    #0xffffffff    #declare  -i strmask1=4294967295  declare  -i strMask1=0xffffffff   #echo   $strMask 1   ((strmask1=strmask1<< (32- Mask)    #echo   $strMask 1   (strmask2=~STRMASK1)    #echo   $strMask 2   ((networkaddr=iph & strmask1))     ((bcastaddr=  (IPH&NBSP;|&NBSP;STRMASK2)  &  0xffffffff)    #echo  $ networkaddr | awk  ' {printf  "%x\n", $ '    #echo   $bcastAddr  | awk   ' {printf  '%x\n ', $ '        ((iphex[1]=networkaddr>>24 & &NBSP;0X000000FF)    ((IPHEX[2]=NETWORKADDR&GT;&GT;16&NBSP;&AMP;&NBSP;0X000000FF))    ((Iphex [3]=networkaddr>>8 & 0x000000ff)    (iphex[4]=networkaddr &  0X000000FF))   echo -e  "Network address   : ${iphex[1]}.${iphex[2" }.${IPHEX[3]}.${IPHEX[4]} "     ((IPHEX[1]=BCASTADDR&GT;&GT;24&NBSP;&AMP;&NBSP;0X000000FF))    ((IPHEX[2]=BCASTADDR&GT;&GT;16&NBSP;&AMP;&NBSP;0X000000FF))    ((iphex[3]=bcastaddr> >8 & 0x000000FF)    ((iphex[4]=bcastaddr & 0x000000ff))   echo -e  "broadcast &NBSP;ADDRESS&NBSP;:&NBSP;${IPHEX[1]}.${IPHEX[2]}.${IPHEX[3]}.${IPHEX[4]} "done

This article from "The End of Nanshan" blog, declined to reprint!

IP network address and broadcast address calculation for shell scripts