nohup and Background Process
nohup (short for no hang up) is used to run a command or program in the background.  
- The process continues even if you close the terminal tab.
-  It stops when you shut down the system.
-  Without nohup, closing the terminal will terminate the process.
  
  
  Common Commands
| Command | Description | 
| nohup program_file | Runs the given program in the background. | 
| nohup program_file >> storing_file | Runs the program in the *background and stores the output in another file ( storing_file). *(Press Enter twice to continue) | 
| top | Displays all currently running processes. | 
| ps | Shows the status of active processes (Process Status). | 
| ps -aux | Lists detailed information about all running processes. | 
| cat storing_file | Displays the entire log content of a stored background process. | 
| tail -f storing_file | Shows the last 10 lines and updates live as new logs appear. | 
| tail -10 storing_file | Displays only the last 10 lines of the file. | 
| kill -9 process_id | Forcefully stops a process using its process ID (find it using ps -aux). | 
| grep file_name | Searches for a matching pattern inside a specific file. | 
  
  
  Zip and Unzip Commands
| Command | Description | 
| sudo apt install zip | Installs the zippackage. | 
| zip zip_name.zip file_name | Compresses a single file. | 
| zip -r zip_name.zip folder_name | Compresses a folder recursively (includes all sub-files and directories). | 
| unzip zip_name.zip | Extracts the contents of a zip file. | 
  
  
  Disk Commands
| Command | Description | 
| df -h | Displays the disk space usage of all drives (in human-readable format). | 
| du -sh | Shows how much disk space a particular file or directory uses. | 
Quick Summary
- Use nohupto run programs in the background safely.
- Use ps,top, andkillto manage processes.
- Use zipandunzipfor file compression.
- Use dfandduto monitor disk usage.
 
              
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