netstat functions

netstat-functions.sh

# List connections for port
netstat -an | grep 12345

# List the number and type of active network connections
netstat -ant | awk '{print $NF}' | grep -v '[a-z]' | sort | uniq -c

# Number of connections for each hosts
netstat -an | grep ESTABLISHED | awk '{print $5}' | awk -F: '{print $1}' | sort | uniq -c | awk '{ printf("%s\t%s\t",$2,$1) ; for (i = 0; i < $1; i++) {printf("*")}; print "" }'

# Number of connections for each port
netstat -tuna | awk -F':+| +' 'NR>2{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n