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BEGIN {
    net2req["id1"] = "req1"
    allreq["req1"] = "req1"
}

# 1. found received rpc named 'network_sync', extracted req-id and store it to associative arrays.
#    print the line
# 2. found arg dropped for the req-id, print the line
# 3. found notify agen add-fdb, delete the req-id in the associative array, print the line
{

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function string_ops:string (val) %{
  strlcpy (STAP_RETVALUE, (char*)STAP_ARG_val, MAXSTRINGLEN);
%}

probe kernel.function("__dev_queue_xmit") {
    if (execname() =~ "keepalived")  {
        printf("__dev_queue_xmit %d %s(%d/%d) %s\n", gettimeofday_us(), execname(), pid(), cpu(), $$vars);
        i = 0;
        printf("dump begin, skb->gso %d\n", @cast($skb->head+$skb->end, "skb_shared_info", "")->gso_size);
        for (; i< 14; i++) {

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<?xml version="1.0" encoding="UTF-8"?>
<!-- vi: set et smarttab sw=2 tabstop=2: -->
<!--
 Copyright (c) 2014, 2015 Cisco Systems, Inc. and others.  All rights reserved.

 This program and the accompanying materials are made available under the
 terms of the Eclipse Public License v1.0 which accompanies this distribution,
 and is available at http://www.eclipse.org/legal/epl-v10.html
-->
<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"

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cat xxx.txt  | tr , ' ' | grep keepalive | awk '{ sum+=$1 } END {print sum/160}'

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import eventlet
pool = eventlet.GreenPool()
def bomb():
	a = eventlet.connect(("127.0.0.1", 9697))
	eventlet.sleep(10)
	a.close()
	
i=0
while i<5000:
	pool.spawn(bomb)

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ps -eo rss,pid,comm  |  awk '{s+=$1} END {print s}'

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ifname=$1

let bytes1=0
while true; do
        let bytes2=`ip -s link  show $ifname  | grep -A 1 RX | grep -v RX | awk '{print $1}'`
        let diff=(bytes2 - bytes1)
        let diff=(diff / 1024 / 1024)
        echo "bandwitdth is $diff Mbps"
        let bytes1=bytes2
        sleep 1

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mplayer2  -dumpstream /dev/sr0 -nocache -noidx -dumpfile record.mp4

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1. pacmd is a good tool to help you get current pulseaudio information.
   list-sinks
   list-clients

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Modern Unix systems use user groups to control access privileges. The wheel group is a special user group used on some Unix systems to control access to the su command, which allows a user to masquerade as another user (usually the super user).