Linux analysing tools

[FireShootSK]

Linux have default installed a lot of programs to analyse network traffic,system monitors, memory scan etc.
Here is my little list.

System/Memory/Disk monitoring tools:

• top

Via top you got dynamic real-time view to all process runned on system.

$ top

Spoiler: Controls

Z,B Global: 'Z' change color mappings; 'B' disable/enable bold
l,t,m Toggle Summaries: 'l' load avg; 't' task/cpu stats; 'm' mem info
1,I Toggle SMP view: '1' single/separate states; 'I' Irix/Solaris mode

f,o . Fields/Columns: 'f' add or remove; 'o' change display order
F or O . Select sort field
<,> . Move sort field: '<' next col left; '>' next col right
R,H . Toggle: 'R' normal/reverse sort; 'H' show threads
c,i,S . Toggle: 'c' cmd name/line; 'i' idle tasks; 'S' cumulative time
x,y . Toggle highlights: 'x' sort field; 'y' running tasks
z,b . Toggle: 'z' color/mono; 'b' bold/reverse (only if 'x' or 'y')
u . Show specific user only
n or # . Set maximum tasks displayed

k,r Manipulate tasks: 'k' kill; 'r' renice
d or s Set update interval
W Write configuration file
q Quit

Spoiler: Screenshot

• ps

PS display all current processes with CPU & memory usage,PID,uptime, process start time and user.

$ ps
you can PS run with this subcommands
-A,aux,-A1,-A1F,ps axjf

Spoiler: Screenshot

• kill

This command terminate process.

$ kill PID

• free

The command free displays the total amount of free and used physical and swap memory in the system, as well as the buffers used by the kernel.

$ free

Spoiler: Screenshot

• iostat

The iostat command is used for monitoring system input/output device loading by observing the time the devices are active in relation to their average transfer rates. The iostat command generates reports that can be used to change system configuration to better balance the input/output load between physical disks.

$ iostat

Spoiler: Screenshot

• pmap

The command pmap report memory map of a process. Use this command to find out causes of memory bottlenecks.

$ pmap -d PID

Network monitoring tools:

• iptraf

The iptraf command is interactive colorful IP LAN monitor. It is an ncurses-based IP LAN monitor that generates various network statistics including TCP info, UDP counts, ICMP and OSPF information, Ethernet load info, node stats, IP checksum errors, and others.

$ sudo apt-get install iptraf
$ sudo iptraf

Spoiler: Screenshot

• tcpdump

Tcpdump is simple command that dump traffic on a network.

$ sudo tpcdump
example: tcpdump -i eth0 'udp port 53'

Spoiler: Screenshot

Sayonara