Linux Commands — nohup, Zip & Disk Management

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.

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Zip and Unzip Commands

Command	Description
sudo apt install zip	Installs the zip package.
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.

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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.

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Quick Summary

• Use nohup to run programs in the background safely.
• Use ps, top, and kill to manage processes.
• Use zip and unzip for file compression.
• Use df and du to monitor disk usage.