KubeOps Linux CheatSheet

This is Day to Day Work Linux Cheatsheet for Software Engineers.

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Name	Command
Change Directory	cd /
Change Directory to Previous	cd ..
Create Directory	mkdir
Create Directory with Parent	mkdir -p /
Remove Directory	rm -r
Remove Directory without prompt	rm -rf
Remove empty Directory	rmdir
Copy Directory	cp -r
Move Directory	mv

Name	Command
Search files in a directory	find -name
Search files in a directory with case-insensitive	find -iname
Search files in a directory and execute command on it	find -name -exec `<command>`
Search text in file	grep `<text>`
Search text in file with line numbers	grep -n `<text>`
Search text in file with case-insensitive	grep -i `<text>`
Search text in file for all patterns given	grep -e `<text>`
Search multiple text with case-insensitive and all pattern given	grep -ie `<text1>` -ie `<text2>` -ie `<text3>` -ie `<textn>`
Search file for any lines that don’t include the content	grep -v ‘‘

Name	Command
Send stdout of cmd1 to cmd2	cmd1 `\	` cmd2
Send stderr of cmd1 to cmd2	cmd1 `\	&` cmd2

Name	Command
Show content of the file	cat
Create a file with content	cat `<<EOF >` #!/bin/bash `<content>` `EOF`
Create an empty file	touch
Remove file	rm
Remove file without prompt	rm -f
Copy file	cp
Move file	mv
Show first n lines of file	head -n
Show last n lines of file	tail -n
Keep showing last 10 lines of file	tail -f
Show total line in a file	cat \	wc -l
List files in current directory	ls
List files, hidden files in current directory	ls -a
List files in current directory with their permissions and sizes	ls -l
List files in current directory with their permissions, sizes, units	ls -lh
Paginate the content of file	cat `\	` less
Create symbolic link to source file in current directory	ln -s
Create symbolic link to source file in directory	ln -s
Extract .tar.gz file	tar -zxvf
See the differences between files	diff

Name	Command
Change file permission with permission number	chmod 755
Change directory permission with permission number	chmod -R 755
Change directory permission with letters	chmod -R u+rw,g+r,o+x
Change file owner	chown
Change file owner with user’s login group	chown :
Change directory and its content owner recursively	chown -R

Name	Command
Shows processes for the current shell	ps
View all the running processes	ps -A or ps -e
View all processes associated with the terminal	ps -a
View all processes associated with the terminal and show user	ps -aux
Kill specific process id	kill -SIGTERM …
Lists signal	kill -l
Kill all processes with specifies name	pkill
Kill all processes with case-insensitive	pkill -i
Kill specific running command	pkill -f
Kill all processes with specific signal	pkill —signal `<signal>`
Show dynamic real-time processes list of specific user	top -u `<user>`

To understand Vim well, we need to understand Vim editing modes. Vim has 6 basic modes which are:

Name	Description	Help page
normal	For navigation and manipulation of text. This is the default mode.	:help Normal-mode
insert	For inserting new text.	:help Insert-mode
visual	For manipulation of text selection.	:help Visual-mode
select	Similar to a visual mode, but with a more MS Windows-like behavior.	:help Select-mode
command-line	For entering editor commands - like the help commands (:help), quit (:q)	:help Command-line-mode
Ex-mode	Similar to a command-line mode but optimized for batch processing.	:help Ex-mode

Name	Command	Example
Edit a file	vi
Enter an insert mode to insert new text	i
Insert a blank line under the current line and switch to an insert mode	o
Switch to an insert mode and move a cursor to the end of line (Append)	A
Copy the current line	yy
Paste copied text after the current cursor position	p
Delete the current line and switch to an insert mode (Change a line)	cc
Delete the current line and stay in an normal mode	dd
Delete from the current cursor position to the end of a word	dw
Delete before the current cursor position to the beginning of a word	db
Delete a character at the current cursor position and stay in a normal mode	x
Delete and switch to an insert mode from the current cursor postion to the end of line	C
Delete a character and switch to an insert mode (Substitute a character)	s
Move the cursor left	h
Move the cursor down	j
Move the cursor up	k
Move the cursor right	l
Go to the begining of the first line	gg
Go to the begining of the last line	G
Go to a line number	`<row_number>` + gg
Go to a column number	`<column_number>` + \
Search keyword	/ `<keyword>`
Search keyword with case-insensitive	/`<keyword>`\c
Move to the next found keyword after searching	n
Move to the previous found keyword after searching (invert of n)	N
Visual selection a character at the current cursor position	v
Visual selection the current line	V
Tab right	shift + .
Tab left	shift + ,
Repeat a last change	.
Undo change	u
Redo change	ctrl + r
Save and quit	:wq
Quit (The most important Vi/Vim command)	:q

Name	Command
Stop Current Command	CTRL + c
Sleep Program	CTRL + z
Search History	CTRL + r
Repeat Last Command	!!
Run the most recent command that matches with starting character(s) of string	!`<string>`

Name	Command
Run command1 then command2	`<command1> ; <command2>`
Run command2 if command1 is successful	`<command1> && <command2>`
Run command2 if command1 is not successful	` \	\	`

Name	Command
Display all network interfaces and IP addresses	`ifconfig -a`
Send echo requests to the target host to verify connectivity	`ping <host>`
Get who is information for domain	`whois <domain>`
Get DNS information for domain	`dig <domain>`
Reverse lookup host	`dig -x <host>`
Display name of server	`hostname`
Download file	`wget <file>`
Listing all listening connections ports	`netstat -a`

An A-Z Index of Linux command line: Link