# NMAP Diffing

```
#!/bin/bash
mkdir /opt/nmap_diff
d=$(date +%Y-%m-%d)
y=$(date -d yesterday +%Y-%m-%d)
/usr/bin/nmap -T4 -oX /opt/nmap_diff/scan_$d.xml 10.100.100.0/24 > /dev/null 2>&1
if [ -e /opt/nmap_diff/scan$y.xml ]; then
    /usr/bin/ndiff /opt/nmap_diff/scan_$y.xml /opt/nmap_diff/scan_$d.xml > /opt/nmap_diff/diff.txt
fi
```