basic nmap scanning argument iterations and logging

nmap.sh

#!/usr/bin/env bash
#
# Run various nmap scans on a hostname and log all scans to a single file.
#
# Alternatively, nmap does support log-output arguments on it's own, but the problem is 
# grouping various scans that often conflict during the same process, thus requiring 
# a series of multiple scans and would create multiple logs.
# 
# usage examples: 
# default scan:
# sudo ./nmap.sh somedomain.net
#
# single port scan:
# sudo ./nmap.sh somedomain.net 22
#
# multi-port scan:
# sudo ./nmap.sh somedomain.net 22,23,24,etc.
#
# port-range scan:
# sudo ./nmap.sh somedomain.net 22-2222
#
# Default Ports (if null): 1-65535
#
ARGS="-O -sA -sT -sN -sM -sS -sW -sU";

TARGET="$1 -P0";
LOG="$0.$1.log";

if [ -z $2 ]; then
  PORTS="1-65535";
else
  PORTS=$2;
fi

echo -e "Beginning Scans...\n" > $LOG;

for i in $ARGS; do
  echo -e "\nnmap $TARGET $i -p $PORTS\n" >> $LOG
  nmap $TARGET $i -p $PORTS >> $LOG;
done

echo -e "Done.\n";
less $LOG;

lol why!