Using boolean expression Bash script Post: 302966313

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Top Forums Shell Programming and Scripting Using boolean expression Bash script Post 302966313 by Chubler_XL on Wednesday 10th of February 2016 06:09:31 PM

02-10-2016

Moderator

How about this:

Code:

#!/bin/bash
dec2bin () {
  # dec2bin num [width] [var]
  local bin=""
  for((num=$1;num;num/=2))
  do
    bin=$((num%2))$bin
  done
  ((${#3})) &&
      printf -v ${3} "%0*d" ${2:-1} $bin ||
      printf "%0*d" ${2:-1} $bin
}

xnor () {
    # xnor bits1 bits2 [var]
    local res=""
    for((bit=0;bit<${#1};bit++))
    do
        if ((!done&&${1:bit:1}==${2:bit:1}))
        then
          res=${res}1
        else
          done=1
          res=${res}0
        fi
    done
    ((${#3})) &&
      printf -v ${3} "%d" $((2#$res)) ||
      printf "%d" $((2#$res))
}

echo "Enter the first ip"
read ip1
echo "Enter the second ip"
read ip2

#Separate octs of first ip
set ${ip1//./ }

#convert decimal to binary
dec2bin $1 8 a1
dec2bin $2 8 a2
dec2bin $3 8 a3
dec2bin $4 8 a4

#Separate octs of second ip
set ${ip2//./ }

#convert decimal to binary (second IP)
dec2bin $1 8 b1
dec2bin $2 8 b2
dec2bin $3 8 b3
dec2bin $4 8 b4

done=0
xnor $a1 $b1 c1
xnor $a2 $b2 c2
xnor $a3 $b3 c3
xnor $a4 $b4 c4

echo $c1.$c2.$c3.$c4

Result:

Code:

Enter the first ip
192.168.16.55
Enter the second ip
192.168.7.55
255.255.224.0

Chubler_XL

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shells

shells(4)							   File Formats 							 shells(4)

NAME

       shells - shell database

SYNOPSIS

       /etc/shells

DESCRIPTION

       The shells file contains a list of the shells on the system. Applications use this file to determine whether a shell is valid. See getuser-
       shell(3C). For each shell a single line should be present, consisting of the shell's path, relative to root.

       A hash mark (#) indicates the beginning of a comment; subsequent characters up to the end of the line are not interpreted by  the  routines
       which search the file. Blank lines are also ignored.

       The  following  default	shells are used by utilities: /bin/bash, /bin/csh, /bin/jsh, /bin/ksh, /bin/pfcsh, /bin/pfksh, /bin/pfsh, /bin/sh,
       /bin/tcsh,  /bin/zsh,  /sbin/jsh,  /sbin/sh,  /usr/bin/bash,  /usr/bin/csh,  /usr/bin/jsh,  /usr/bin/ksh,  /usr/bin/pfcsh,  /usr/bin/pfksh,
       /usr/bin/pfsh, and /usr/bin/sh, /usr/bin/tcsh, /usr/bin/zsh. Note that /etc/shells overrides the default list.

       Invalid shells in /etc/shells may cause unexpected behavior (such as being unable to log in by way of ftp(1)).

FILES

       /etc/shells	       lists shells on system

SEE ALSO

       vipw(1B), ftpd(1M), sendmail(1M), getusershell(3C), aliases(4)

SunOS 5.10							    4 Jun 2001								 shells(4)