From 37e14e8bf3c17b57fc3dd1ada14a690b6b5abd3a Mon Sep 17 00:00:00 2001
From: jstolp <jstolp@synopsys.com>
Date: Mon, 2 Mar 2020 15:18:31 +0100
Subject: enhance lsof notes

---
 debug.txt | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

(limited to 'debug.txt')

diff --git a/debug.txt b/debug.txt
index 5b97a65..87ca483 100644
--- a/debug.txt
+++ b/debug.txt
@@ -32,9 +32,13 @@ strace -f -p <pid> -e signal
 # lsof(8)
 #
 
-lsof +fg -p <pid>
-  -p <pid> ... list open files for process
+lsof
+  -a ......... AND slection filters instead ORing (OR: default)
+  -p <pid> ... list open file descriptors for process
   +fg ........ show file flags for file descripros
+  -n ......... don't convert network addr to hostnames
+  -P ......... dont' convert network port to know service names
+  -i <@h[:p]>. show connections to h (hostname|ip addr) with optional port p
 
 file flags:
   R/W/RW ..... read/write/read-write
@@ -46,6 +50,11 @@ uase cases:
 - show open files with file flags
 lsof +fg -p <pid>
 
+- show open tcp connections from user
+lsof -a -u $USER -i tcp
+
+- show open connections to 'localhost' for user
+lsof -a -u $USER -i @localhost
 
 #
 # pmap(1)
-- 
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