September 25, 2014

linux terminal commands | linux command

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Basic linux commands


1.ls -l for listing the files as well as directories those are kept in the particular working directory

syntax 
[root@tatya root]#ls -l

2.ls -la same as 'ls -l'but by this command we can also see the hiden files.

syntax
[root@tatya root]#ls -la

3.ls -li same as 'ls -la' but it will also shows us the inode number of each and every file

syntax
[root@tatya root]#ls -li

4.ls by this command we can see only file names of folder

syntax
[root@tatya root]#ls

5.clear - It will clear the screen

syntax
[root@tatya root]#clear

6.exit - To end a current session as well current terminal logging 

syntax
[root@tatya root]exit

7.touch - To create a new empty file 

syntax
[root@tatya root]#touch 

8.cd to change the present directory 

syntax
[root@tatya root]#cd /home/Tatya

where '/home/Tatya' is the desired directory to be change from '/root'

9.cat - To view the contents of a file and it is also used for creating a new file with some contents

syntax
[root@tatya root]#cat <file name> to view file contents
[root@tatya root]#cat > newfilename enter,then you can write something in the file and then to save the file contents press clt+d then enter

10.mkdir to make a new directory 

syntax 
[root@tatya root]#mkdir newdirname

you can also create a directory at your desired path without changing your present working directory
syntax
[root@tatya root]#mkdir /home/tatya/newdirname

11.rm to remove a empty file 

syntax
[root@tatya root]#rm filename 

12.rmdir to remove a empty directory

syntax
[root@tatya root]#rmdir directoryname

13.rm [-i/-r/-f] to remove a directory with its subdirectories as well as its files that is to remove a directory which already contains some files in it

syntax
[root@tatya root]#rm -i directory or filename

-i stands for interactively
 -r stands for recursively
 -f stands for forcefully

14.cp to copy something in a destination file or directory 

syntax
[root@tatya root]#cp sourcepath destinationpath

example: [root@tatya root]# cp/home/tatya/helloworld.txt /root/hello
In this example the helloworld.txt  file will be copied in /root/hello directory

15.mv to move one file or directory from one place to another place, it is also used for renaming a directory or file

syntax
[root@tatya root]#mv source destination
[root@tatya root]#mv oldfilename newfilename 

16.dir to view the subdirectories and filesn under the directory 

syntax
[root@tatya root]#dir

17.su - to become a super user 

syntax
[helloworld@tatya helloworld]$su -
output : [root@tatya root#]

18.pwd to view the present working directory 

syntax
[root@tatya root]#pwd

19.rpm -ivh to intall a rpm package

syntax
[root@tatya root]#rpm -ivh packagename.rpm

rpm stands for 'redhat package manager'
 -i stands for install
 -v stands for verbose mode
 -h stands for with hash sign(#)

20.rpm -q to querry about any rpm package 

syntax
[root@tatya root]#rpm -q packagename 

21.rpm -e to uninstall a rpm package

syntax
[root@tatya root]#rpm -e package

22.find / -name to find any file or directory in linux file system

syntax
[root@tatya root]#find / -name filename

23.userdel to remove a user from linux

syntax
[root@tatya root]#userdel satish

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