### 1. pwd command
To find out the path of the current working directory (folder).

### 2. ls command
To know what files are in the directory you are in. 

### 3. cd command
To navigate through the Linux files and directories.

### 4. mkdir command
To create a folder or a directory.

    $ mkdri folderName

### 5. rmdir command
If you need to delete a directory, use the rmdir command. However, rmdir only allows you to delete empty directories.

    $ rmdir folderName

### 6. rm command
To delete files and directories within them. Use "rm -r" to delete just the directory. 

    $ rm fileName

### 7. touch command
 The touch command is used to create a file. It can be anything, from an empty txt file to an empty zip file.

    $ touch new.txt

 ### 8. cp command
To copy files from the current directory to a different directory. It takes two arguments: The first is the location of the file to be copied, the second is where to copy.

    $ cp scenery.jpg /hochmod commandme/username/Pictures

### 9. mv command
To move files through the command line.We can also use the mv command to rename a file.We can also use the mv command to rename a file. For example, if we want to rename the file “text” to “new”, we can use “mv text new”. It takes the two arguments, just like the cp command.

    $ mv new.txt text.txt

### 10. locate command
You can use this command to locate a file, just like the search command in Windows.

    $ locate text.txt

### 11. echo command
To move some data into a file.

    $ echo hello, my name is alok >> text.txt

### 12. cat command
To display the contents of a file. It is usually used to easily view programs.

    $ cat text.txt

### 13. df command
The df command shows the size, used space, and available space on the mounted filesystems of your computer.

### 14. du command
Use du to know the disk usage of a file in your system.

### 15. diff command
The diff command compares two text files and shows the differences between them. There are many options to tailor the display to your requirements.

    $ diff file1.ext file2.ext


### 16. tar command
The tar command is the most used command to archive multiple files into a tarball — a common Linux file format that is similar to zip format, with compression being optional.

```
## Untar files in Current Directory ##

tar -xvf file.tar
```

some examples of tar commands
https://www.tecmint.com/18-tar-command-examples-in-linux/

### 17. zip, unzip command
Use zip to compress files into a zip archive, and unzip to extract files from a zip archive.

### 18. uname command
The uname command, short for Unix Name, will print detailed information about your Linux system like the machine name, operating system, kernel, and so on.

### 19.chmod command
To make a file executable and to change the permissions granted to it in Linux.

    $ chmod +x numbers.py

### 20. hostname command
 To know your name in your host or network. Adding a -i to the end will display the IP address of your network.

### 21. ping command
To check your connectivity status to a server. For example, by simply entering ping google.com, the command will check whether you’re able to connect to Google and also measure the response time.

### 22. history command
The history command lists the commands you have previously issued on the command line. You can repeat any of the commands from your history by typing an exclamation point ! and the number of the command from the history list.

### 23. exit command
The exit command will close a terminal window, end the execution of a shell script, or log you out of an SSH remote access session.

### 24. shutdown command
The shutdown command lets you shut down or reboot your Linux system.

### 25. To update System

    $ sudo apt update
    $ sudo apt upgrade

### 26. Find text in files
Find "Spreadsheets" text in files with extension '.go'
```
$find . -type f -name "*.go" -exec grep -lr  "Spreadsheets" {} \;
```