# Basic socket statistics command usage (ss)

###### tags: `linux` `network`

# list tcp/udp/unix establised and connected connections
# use -e to print extend info
ss -t
ss -te

# also list listening
ss -at 

# list udp 
ss -ua

# no resolve hostname 
ss -nt

# only listening
ss -ltn
ss -lun

# print process name and pid
ss -ltp

# print summary statistics
ss -s

# print timer
ss -tno

# ipv4 or 6
ss -lt -f inet
ss -lt4
ss -lt6

# filter tcp connection state
ss -t4 state [established | sync-sent | sync-recv | time-wait | closed | close-wait | connected | ... ]

# filter address and port
ss -t4 state established dport = :22

ss -at '( dport = :22 or sport = :22 )'
ss -at '( dst :443 or dst :80 )'
ss -at dst :443 or dst :80

ss -at dst 192.168.1.1
ss -at dst 192.168.1.0/24
ss -at dst 192.168.1.1:22

ss -at src 192.168.1.1 sport gt :3000
compare operator: lt , ge , eq , gt , lt , ne
compare operator: >  , >= , == , <  , >  , !=