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Compare IP addresses and increment

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# 1  
Old 10-04-2013
Compare IP addresses and increment
Basically, I have 2 files with IP address. For example 134.123.3.234 in the first file and 134.123.3.235 in the second. Now I want to create a file with a IP address with IP 134.123.3.236...(max 254). So i have to check files which IP address in previous two files and base on that to create a new file with the next IP address which is 134.123.3.236. I wanted to check last number of IP...If it is 254 then increment +1 to third number....


Code:
for ip in {0..254}
do
if "192.168.${ip}.${j}" > $file
 echo "192.168.${ip}.${j}"> Newfile.txt
for j in {0..254}
 do
if "192.168.${ip}.${j}">$file then 
echo "192.168.${ip}.${j}"> Newfile1.txt
done
done

Basically, this code is not correct. Have no idea how to solve this problem. Hope you will help me....thanks.
Last edited by Don Cragun; 10-04-2013 at 01:36 AM.. Reason: Add CODE tags
# 2  
Old 10-04-2013
Code:
ip=`head -n1 file.dat`					# read ip address from file
end=${ip##*\.}						# delete everthing before last dot (leaving 234/235)

while (( end++ < 254 )); do				# while the 234/235 is less than 254 (increment each time tested)
	printf 134.123.3.$end"\r\n" >> NewFile.txt	# append your incremented ip address to NewFile.txt
done

Last edited by jethrow; 10-04-2013 at 02:11 AM..
This User Gave Thanks to jethrow For This Post:
Manu1234567
# 3  
Old 10-04-2013
Quote:
Originally Posted by jethrow
Code:
ip=`head -n1 file.dat`
end=${ip##*\.}

while (( end++ < 254 )); do
    printf 134.123.3.$end"\r\n" >> NewFile.txt
done

Thank for replying. can you explain what it does....New here, sorry... (Tried to compile but still not sure what some lines do)
# 4  
Old 10-04-2013
-- delete
Last edited by roche; 10-04-2013 at 03:00 AM.. Reason: delete
# 5  
Old 10-04-2013
Two nested loops will cycle through all combinations.
A break will exit the current loop.
Code:
#!/bin/bash
for ip in {0..254}
do
  for j in {0..254}
  do
    if grep -qw "192\.168\.${ip}\.${j}" firstfile secondfile
    then
      : # exists
    else
      echo "192.168.${ip}.${j}" >Newfile1.txt
      break 2 # exit this loop and the next loop
    fi
  done
done

# 6  
Old 10-04-2013
Not quite sure I understand your request. Start at the highest IP in your two files, and create 254 IP addresses from there? Try:
Code:
sort file1 file2 | tail -1 | { IFS="." read A B C D; for J in {1..25}; do [ $((++D)) -eq 255 ] && { ((C++)); D=0; }; echo $A.$B.$C.$D; done }
134.123.3.236
134.123.3.237
134.123.3.238
134.123.3.239
134.123.3.240
134.123.3.241
134.123.3.242
134.123.3.243
134.123.3.244
134.123.3.245
134.123.3.246
134.123.3.247
134.123.3.248
134.123.3.249
134.123.3.250
134.123.3.251
134.123.3.252
134.123.3.253
134.123.3.254
134.123.4.0
134.123.4.1
134.123.4.2
134.123.4.3
134.123.4.4
134.123.4.5
etc...

# 7  
Old 10-06-2013
Quote:
Originally Posted by jethrow
Code:
ip=`head -n1 file.dat`                    # read ip address from file
end=${ip##*\.}                        # delete everthing before last dot (leaving 234/235)

while (( end++ < 254 )); do                # while the 234/235 is less than 254 (increment each time tested)
    printf 134.123.3.$end"\r\n" >> NewFile.txt    # append your incremented ip address to NewFile.txt
done

Thats cool but when its 254 i need to increment third oct....but in code we deleted it lol how to make it happen?Smilie

---------- Post updated at 02:25 PM ---------- Previous update was at 02:09 PM ----------

Quote:
Originally Posted by RudiC
Not quite sure I understand your request. Start at the highest IP in your two files, and create 254 IP addresses from there? Try:
Code:
sort file1 file2 | tail -1 | { IFS="." read A B C D; for J in {1..25}; do [ $((++D)) -eq 255 ] && { ((C++)); D=0; }; echo $A.$B.$C.$D; done }
134.123.3.236
134.123.3.237
134.123.3.238
134.123.3.239
134.123.3.240
134.123.3.241
134.123.3.242
134.123.3.243
134.123.3.244
134.123.3.245
134.123.3.246
134.123.3.247
134.123.3.248
134.123.3.249
134.123.3.250
134.123.3.251
134.123.3.252
134.123.3.253
134.123.3.254
134.123.4.0
134.123.4.1
134.123.4.2
134.123.4.3
134.123.4.4
134.123.4.5
etc...

I see.... in sort command we have 2 files... What about if i have a path to bunch of files??? /Users/unknown/files/* I put after sort but it does not work lol How i can put this path? Smilie
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