Using boolean expression Bash script Post: 302966313

Sponsored Content

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

View Public Profile for Chubler_XL

Find all posts by Chubler_XL

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Regular expression boolean in perl

How can I find out, that whether a regular expression are matched or not(as a boolean)?! tnx in advance.

2. Shell Programming and Scripting

[Bash]Function returning a boolean

Hello all, I would like to know if it is possible to return a the result of a boolean expression from a function like this function() { # some code return || } and what will be the return value ? Thank you for help.

3. Shell Programming and Scripting

Boolean expression issues

Hi everybody: I'm working on a script to send emails with logs attached based on one single rule..."check if the number of errors has increased since the last time the script ran" Basically what my script does is read from a previous file with the last trace of errors the previous error...

4. Shell Programming and Scripting

boolean expression in bash

Can someone, please, help me to make this condition valid/accepted in bash? I really cannot. I'm stuck with the brackets... This one tells me: missing `]' if ]; then # NOTIFY ERROR... fi And... I'd also appreciate a link to bash documents that explain these things. All...

5. UNIX for Dummies Questions & Answers

Im new to bash scriping and i found this expression on a bash script what does this mean.

# check host value regex='^(||1|2|25)(\.(||1|2|25)){3}$' if ')" != "" ]; then if ]; then echo host $host not found exit 4 fi elif ]; then echo $host is an invalid host address exit 5 fi espeacailly the top regex part? ---------- Post updated at 06:58 PM ---------- Previous update was...

6. Shell Programming and Scripting

Hi im new to bash scripting I want to know what does the regex expression do ??

# check host value regex='^(||1|2|25)(\.(||1|2|25)){3}$' if ')" != "" ]; then if ]; then echo host $host not found exit 4 fi elif ]; then echo $host is an invalid host address exit 5 fi

7. Shell Programming and Scripting

Boolean expression

hi, im learning python language. and my teacher gives me this question on class: Boolean expression : not (p or not q) what is the correct answer for that? i still dont understand, and please give me a link for a new beginner in python to learn. thanks

8. Shell Programming and Scripting

Getting error in bash script; expr $a + 1: integer expression expected

Hi, I am new to shell/bash script. I am trying to run below script #!/bin/bash a=0 b=10 if then echo "a is equal to be" else echo "a is not equal to be" fi MAX=10 while do echo $a a='expr $a + 1' done

9. Shell Programming and Scripting

How to assign result of boolean expression?

Hello I would to write the test on one line like : declare -i x=0 y=0 ........ some code assign value 0 or 1 to x and y ........ # if either x or y or both is set to 1, then do something if -o ; then do_something fi Any help is welcome

10. UNIX for Beginners Questions & Answers

How to write a Boolean variable which succeed and failed inside the if loop in shell script ?

I have if loop with multiple variable value check in if loop. How can i print only if loop satisfied variable and its value in shell script ? I dont want to check each variable in if loop. That makes my script larger. if ] then echo "Only satisfied variable with value" ...

LEARN ABOUT SUNOS

endusershell

getusershell(3C)					   Standard C Library Functions 					  getusershell(3C)

NAME

       getusershell, setusershell, endusershell - get legal user shells

SYNOPSIS

       #include <unistd.h>

       char *getusershell(void);

       void setusershell(void);

       void endusershell(void);

DESCRIPTION

       The  getusershell()  function  returns  a  pointer  to  a  legal  user  shell  as defined by the system manager in the file /etc/shells. If
       /etc/shells does not exist, the following locations of the standard system shells are used in its place:

       /bin/bash		  /bin/csh
       /bin/jsh 		  /bin/ksh
       /bin/pfcsh		  /bin/pfksh
       /bin/pfsh		  /bin/sh
       /bin/tcsh		  /bin/zsh
       /sbin/jsh		  /sbin/pfsh
       /sbin/sh 		  /usr/bin/bash
       /usr/bin/csh		  /usr/bin/jsh
       /usr/bin/ksh		  /usr/bin/pfcsh
       /usr/bin/pfksh		  /usr/bin/pfsh
       /usr/bin/sh		  /usr/bin/tcsh
       /usr/bin/zsh		  /usr/xpg4/bin/sh

       The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells.

       The setusershell() function rewinds the file or the list.

       The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells.

RETURN VALUES

       The getusershell() function returns a null pointer on EOF.

BUGS

       All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved.

SunOS 5.10							    30 Aug 2004 						  getusershell(3C)