Linux/MacOS统计处于各个状态的TCP连接数

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Linux

netstat -npt | awk 'NR>2 {++S[$1]} END {for (s in S) print s, S[s]}'

示例返回

LAST_ACK 1
SYN_RECV 10
CLOSE_WAIT 18
ESTABLISHED 9980
FIN_WAIT1 4
FIN_WAIT2 1
TIME_WAIT 2838

MacOS

netstat -n -p tcp | awk 'NR>2 {++S[$6]} END {for (s in S) print s, S[s]}'

示例返回

TIME_WAIT 15
ESTABLISHED 253