UNIX OS was developed by AT&T Labs and quiet differenct from Microsoft Windows. It is more a Command based system rather than a GUI based system, Its strength is reliablity stubborn and less prone to get corrupted. The best for a normal user is not to get the PC rebooted every day.
A Point which makes it less popluar is being a Commands based system rather a show business.The core called as Kernel and the the user interfaces are Ksh Korn Shell, bash Bourne against shell and csh
As like other OS the commands given by the user in English is converted by the core that is kernel into ASCII characters 0’s and 1’s and sent to CPU (The Central Processing Unit).
Incase of response from CPU to End user the vice versa of the above mentioned process is followed.
Some basic commands to start with:-
1. If we want to make Backspace key an erase key than need to give this command
stty erase backspace key
If we want to take output of some command pasted in a file. We could use the symbol >.
For example if we want to take the output of cal which comes with the output as date & time.
We can write the command as
hence the command output of cal would be saved in the file named as cal.txt.
2. Now the next question could be where it is saved. We can check where we are currently working in ksh or with the command as echo $SHELL
3. To Check the permissions of the file is by -la. We can modify the same to read write and rename the files restricted to the users except the admin.