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. Is it possible to write a script that reproduces the information provided by uptime and top ? The answer is yes, and it’s not too difficult with a little help. In the following sections, I present Python scripts

stacks, routing tables, ARP tables, and firewalls separately, as well as /proc/net, /sys/class/net/, QoS policies, port numbers, and sockets in such a way that individual applications can find a particular

-sent:           22,334 (total)              0/s  (Per-Sec)    pkts-recv:           68,018 (total)              2/s  (Per-Sec) lo    Bytes-sent:          2.55 K (total)         0.00 B/s  (Per-Sec)    Bytes

.519354 pkts=6 kpps=0.0 kbytes=0 mbps=0.0 nic_pkts=16 nic_drops=0 u=2 t=2 i=0 o=0 nonip=2 1415510244.519597 pkts=6 kpps=0.0 kbytes=0 mbps=0.0 nic_pkts=22 nic_drops=0 u=2 t=2 i=0 o=0 nonip=2 1415510247

1-12:00:00 20 144400 1-16:06:40 21 160000 1-20:26:40 22 176400 2-01:00:00 23 193600 2-05:46:40 24

, 378501 c/s virtual 18 Long: 1063K c/s real, 1063K c/s virtual 19 20 Benchmarking: LM DES [64/64 BS]... DONE 21 Raw: 8214K c/s real, 8214K c/s virtual 22 23 Benchmarking: NT MD4 [Generic 1x]... DONE 24

, change Registry parameters, work with Active Directory, manipulate services, look at events, work with Windows Management Instrumentation (WMI), and much more. PowerShell is a Windows administrator’s best ... should see a table listing all of your system’s running processes that looks similar to Task Manager’s Processes tab. PowerShell on Your Local System Before touching production systems with Power ... , change Registry parameters, work with Active Directory, manipulate services, look at events, work with Windows Management Instrumentation (WMI), and much more. PowerShell is a Windows administrator’s best

profiling approach is fairly simple but involves inserting timing points into your code. Timing points surround a section of code and collect the total elapsed time(s) for the section, as well as how many

-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=libaio, iodepth=32 fio-3.16 Starting 1 process Jobs: 1 (f=1): [w(1)][100.0%][w=1733KiB/s][w=433 IOPS][eta 00m:00s] test: (groupid=0, jobs=1): err= 0: pid

Destination MAC address Listing 1 Nemesis arp Packets 01 $ while true 02 > do 03 > sudo nemesis arp -v -r -d eth0 -S 192.168.1.2 -D 192.168.1.133 -h 00:22:6E:71:04:BB -m 00:0C:29:B2