Error- Nmap shell script goes in infinite loop

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@sonal said in Error- Nmap shell script goes in infinite loop:

Any suggestions to fix this?

I have tested your script and it does not run in an infinite loop for me, however, it runs for a long time as it scans each host multiple times. I think the problem is the following statement where you instruct nmap to read the list of hosts from file (btw I think $line1 is undefined in this context).

nmap -oG output.txt -T4 -f -iL iplist.txt $line1

See excerpt from man page:

Usage: nmap [Scan Type(s)] [Options] {target specification}
TARGET SPECIFICATION:
  Can pass hostnames, IP addresses, networks, etc.
  Ex: scanme.nmap.org, microsoft.com/24, 192.168.0.1; 10.0.0-255.1-254
  -iL <inputfilename>: Input from list of hosts/networks
  -iR <num hosts>: Choose random targets
  --exclude <host1[,host2][,host3],...>: Exclude hosts/networks
  --excludefile <exclude_file>: Exclude list from file

So, either you read the targets from file and remove while loop, or you remove the part -iL iplist.txt from the statement and change the target spec as follows:

nmap -oG output.txt -T4 -f $line