Some useful linux commands

These are mostly used linux commands I applied daily, I paste it here once it is useful for you.

1.	Permanently set the Environment Variables
	classpath=” ” export classpath
2.	To see the hardware configuration
	cat /proc/cpuinfo
3.	Tar commands
	tar –xvvzf myfile.tar.gz // to leave the .tar.gz unchanged
	tar –pczf myfile.tar.gz /path/... // to compress
	gzip –c test.text>test.gz
	tar –xvvf myfile.tar // to extract
4.	To change the login user name
	su username
5.	To see the size of file or directory
	du –skh filename
6.	To show the disk space
	df -h
6.	Copy files from one computer to another
	scp myfile username@xxx.xxx.xxx:c:/ scp myfile username@xxx.xxx.xxx:/opt/ // where xxx is the hostname of target computer
7.	To see the CUP and Memory usage
	top
8.	Vi commands
	vi myfile.config // to view the file
	:q // to exit
	:q! // to exit witout the change
	:wq // to exit with change
	:cw // change word
	:cc // change a line
9.	Make a backup file
	cp –b myfile1 myfile2
10.	Create direcory
	mkdir mydirectory
11.	Set file permission
	chmod 777 mybatch.sh
12.	To check the OS
	cat /etc/redhat-release
13.	Force to delete the directory
	rm –rf direcory
14.	Search for a file name
	find . –name myfile
15.	Start Xwin X server
	Start Cygwin Bash Shell cd /usr/x11R6/bin ./startxwin.bat
16.	View IP Address
	hostname -i
17.	View and kill Processes
	ps: to view processes kill -9 process id
18.	Copy the entire directory
	cp -R dir/ newdir/
19.	View port
	Netstat –an \| grep 9081 Netstat –an > /tmp/port.out

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