Few of the widely used commands — if you need Basic to advanced Linux traning/support , please contact info@tvktechnologies.com
* To find a particular port is active to accpect communicaiton and which process is started that service
ss -peanut | grep <port>-
* To check network ports from one server to another
telnet <hostname/IP> port or
nc -vz <hostname/IP> <port>
example
nc -vz tvktechnologies.com 52000
* To find the top 5 resource consumer process
ps -eo pmem,pcpu,vsize,pid,cmd | sort -k 1 -nr | head -5
* How to check RAM and SWAP allocated and usage
free -g
* File Management
. to open file vi <filename>
==> Insert Mode (Editing Text)
i Insert before cursor
a Insert after cursor
o Open new line below
O Open new line above
I Insert at beginning of line
A Insert at end of line
==> Savings & Existing the file
:w Save file
:q Quit (only if no changes)
:wq or (:x) Save and quit
:q! Quit without saving
:w newfile Save to a new file (Save As)
ZZ Save and quit (no : needed)
==> Navigation / Movement Commands
h Move left
j Move down
k Move up
l Move right
0 (zero) Go to beginning of line
$ Go to end of line
gg Jump to first line
G Jump to last line
:5 Go to line number 5
w Jump forward a word
b Jump backward a word
==> Copy, Cut, Paste (Yank, Delete, Put)
yy Copy (yank) a line
yw Copy a word
dd Delete (cut) a line
dw Delete a word
p Paste after cursor
P Paste before cursor
u Undo last change
Ctrl + r Redo
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