Understanding basic shell commands of Linux

Understanding basic shell commands of Linux:-

Shell:-

The shell act's as the most powerful interaction between user and the kernel in system. The shell is a command line interpreter, it interprets the user typed commands in console of terminal.

There are various types of shells are available, which are as follows:

•       Bourne shell

•       C shell

•       Korn shell

•       Bash shell

Let's discuss some basic shell commands:-

pwd:

The shell command “pwd” prints the current working directory. That means if you are working in home it will display “/home”.

Ex:ravi@ravi:~$ pwd

/home/ravi

cd:

The shell command “cd” allows us to change the directory. We have to move to particular directory to access the contents in it or by specifying explicit  path of a file, so we can access any file.

Ex:

ravi@ravi:~$ cd Downloads

ravi@ravi:~/Downloads$

cat:

The shell command “cat” displays the contents of file in console.

Ex:

ravi@ravi:~$ cat workshop

Displays the contents of file workshop

rm:

The shell command “rm” allows us to remove the file from current directory.          

Ex:

ravi@ravi:~$ rm unixfile

After executing this command the file “unixfile” is removed or deleted.

rmdir:

The shell command “rmdir” allows us to remove the directory from current directory.

Ex:

ravi@ravi:~$ rmdir directory

After executing this command the directory named “directory” is removed from current directory.

touch:

The shell command “touch” allows us to create file in current directory.

Ex:

ravi@ravi:~$ touch newfile

After executing this command the file “newfile” is created in current directory.

mkdir:

The shell command “mkdir” allows us to create directory in current directory.

Ex:

ravi@ravi:~$ mkdir newdir

After executing this command the directory newdir.

nautilus:

The shell command “nautilus”  allows us to show the home window.

Ex:

ravi@ravi:~$ nautilus

ps:

The shell command “ps” allows us to show the current running process started by the user.

Ex:

ravi@ravi:~$ ps

PID TTY          TIME CMD

3795 pts/0    00:00:00 bash

4867 pts/0    00:00:00 ps

top:

The shell command “top” allows us to show the all the daemon process.

Ex:

ravi@ravi:~$ top

ls:

The shell command “ls” allows us to show the contents of current directory.

Ex:ravi@ravi:~$ ls