list/count open connections (sockets) for All/certain process

open connections (sockets) for process

# list open sockets for PID
sudo lsof -p 13264 | egrep 'TCP|UDP'

# count of sockets
sudo lsof -p 13264 | egrep "TCP|UDP" | wc -l


# list the open sockets for all passengers 
passenger-status | grep PID | awk '{ print $3}' | xargs -i sudo lsof -p {} | egrep 'TCP|UDP'


# Alternative command
sudo netstat -anp --inet

You can use grep with -c argument to count your results. You can spare another process call.
sudo lsof -p 13264 | egrep -c "TCP|UDP" is the same as sudo lsof -p 13264 | egrep "TCP|UDP" | wc -l

I'm trying to formulate a command line to give me the number of open sockets/files per process, that is, give me a list with a column with the process name and another column with the number of open sockets, can you help me with that.

ps ax | awk '{ print $1}' | xargs -i sudo lsof -p {} | egrep 'TCP|UDP'