port scanning wihtout a port scanner · Cogito Interruptus Vulgaris

Booya.

For older bash versions

for i in $(seq 1 1 1024); 
do 
echo > /dev/tcp/10.10.10.10/$i; 
[ $? == 0 ] && echo $i >>/tmp/open.txt; 
done

Same thing, newer bash versions

for i in {1..1024}; 
do 
echo > /dev/tcp/10.10.10.10/$i; 
[ $? == 0 ] && echo $i >>/tmp/open.txt; 
done