Basic Linux Commands overview

To view what's written in a file.

Use the 'cat' command to see what's written in the file
```
 cat <filename>
```
To change the access permissions of files.

'chmod' is the command used to change the permissions of the file.

chmod <options permissions> <file>

Permission	Symbol	Description
Read	r	Allows reading and viewing the contents of a file or folder.
Write	w	Allows modifying or deleting the contents of a file or folder.
Execute	x	Allows executing a file (for executable programs or scripts) or accessing a directory.

To check which commands you have run till now.
```
 history
```
To remove a directory/ Folder.

The Linux command to remove a directory or folder is rm. However, when you want to remove a directory, you need to use the -r or -rf option, which stands for "recursive" and allows the removal of directories and their contents.
```
 rm -r <directory>
```
- rm: The command for removing files and directories.
- -r: The option to remove directories and their contents recursively.
- <directory>: The name or path of the directory you want to remove.
To create a fruits.txt file and to view the content.

Create a new file:
```
 touch filename.txt
```
Viewing the contents of the file:
```
 cat fruits.txt
```
Add content in devops.txt (One in each line) - Apple, Mango, Banana, Cherry, Kiwi, Orange, Guava.

Vim (Vi IMproved) is a highly configurable text editor that is available on most Linux distributions. It is an enhanced version of the original Vi editor, which is a standard text editor in Unix-like systems.

Add data to the file:
```
 vim <filename.txt>
```
Click 'i' to enter the insert mode
Click 'ESC' to exit to the insert mode
Then type ':wq ' to save and exit the file editor.
Show only the top three fruits from the file.

To show only the top three fruits from a file in Linux, you can use the head command with the -n (number) option. Here's the command you can use:
```
 head -n 3 fruits.txt
```
Show only the bottom three fruits from the file.

To display only the bottom three fruits from a file in Linux, you can use the tail command with the -n option.
```
 tail -n 3 fruits.txt
```
To create another file Colors.txt and to view the content.

Add content in Colors.txt (One in each line) - Red, Pink, White, Black, Blue, Orange, Purple, and Grey.

To find the difference between fruits.txt and Colors.txt files.
1. diff command: The diff command shows the line-by-line differences between two files. Here's the syntax:
```
 diff fruits.txt colours.txt
```
2. cmp command: The cmp command compares two files byte by byte and displays the first differing byte and its offset. Here's the syntax:
```
 cmp colours.txt fruits.txt
```
3. The vimdiff command allows you to open two files in Vim and highlights the differences between them. Here's the syntax:
```
 vimdiff fruits.txt colours.txt
```

To exit follow these steps: 'ESC' and then ':qa '.

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