/usr/share/grc/conf.netstat is in grc 1.4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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regexp=\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}
colours=magenta
=======
# hostname:service
regexp=([\w\.\-]+):([\w\-]+)\b
colours=yellow, bold green, bold yellow
=======
# hostname:port
regexp=([\w\.\-]+):(\d+)\b
colours=yellow, bold green, bold red
=======
# *:service
regexp=(\*):([\w\-]+)\b
colours=yellow, blue, bold yellow
=======
# ipx hostname
regexp=^IPX.*[\dABCDEF]+:[\dABCDEF]+
colours=green
=======
# protocols
regexp=(^tcp|^udp|^unix|^IPX|STREAM|DGRAM)
colours=bold blue
=======
# status
regexp=FIN_WAIT.*
colours=red
=======
# status
regexp=SYN.*?
colours=bold red
=======
# status
regexp=LISTEN(ING)?
colours=bold blue
=======
# status
regexp=TIME_WAIT
colours=bold red
=======
# status
regexp=CLOS(E(_WAIT)?|ING)
colours=red
skip=yes
=======
# status
regexp=LAST_ACK
colours=red
=======
# status
regexp=ESTAB.*?\b|CONNECTED
colours=bold yellow
=======
# status
regexp=FREE
colours=bold green
=======
# status
regexp=DISCONNECTING
colours=red
=======
# status
regexp=CONNECTING
colours=green
=======
# status
regexp=UNKNOWN
colours=blink bold red
=======
# status
regexp=\[.*\]
colours=green
=======
# path
regexp=(\@)[\dabcdef]+
colours=green, bold green
|