Linux Cheat Sheet by rootissh

uname -a	Show system and kernel info
date	Show system date
uptime	System uptime
whoami	Show current user
mount	Show mounted filesy­stems
man	Show manual for command

env	Show enviro­nment variables
echo "­STR­ING­"	Output string
echo $NAME	Output value of NAME variable
export NAME = value	set "­value to NAME
$PATH	Executable search path
$HOME	Home directory
$SHELL	Current shell

pwd	Shows present working directory
mkdir dirname	Make directory
cd dirname	Change directory
cd ..	Go to parent directory of current dir
ls	list files

-l	Long list
-a	Show all(hidden files too)
-R	Recursive order
-r	Reverse order
-t	Sort by last modified
-m	Comma separated output
-Q	Quoted output
-S	Sort by file size

grep pattern files	Search for patter in files
grep -r	Recursive search
grep -i	Case insens­itive search
grep -v	Inverted search
find /dir/ -name name	Find files starting with name in dir
find /dir/ -user name	Find files owned by name in dir
locate file	Find file

touch file1	create file1
cat file1 file2	concat­enate file and output
file file1	get type of file1
cp file1 file2	Copy file1 to file2
mv file1 file2	Move file1 to file2
rm file1	Delete file1
head file1	show top 10 lines of file1
tail file1	show bottom 10 lines of file1

command < file	read input of command from file
command > file	write output to file
command >> file	Append output to file
command1 | command2	Pipe operator to output of command 1 to command 2

ps	show processes
top	show real time processes
kill pid	Kill process with id pid
pkill name	Kill process with name name
killall name	kill all processes with name name

chown user:group file	Change file owner to user and group to group
chmod 777 file	Change mode of file to 777
The first digit is owner permis­sion,	the second is group and third is user
4	read(r)
2	write(w)
1	execute(x)

CTRL - c	Stop current comand
CTRL - z	Sleep program
CTRL - a	Go to start
CTRL - e	Go to end
CTRL - r	search history
!!	repeat last command
!abc	run last command starting with abc
!$	last argument of previous command
!*	all arguments of previous command