Process Commands

nohup Linux Command

Runs a command that keeps running even after the terminal session is closed.

What does nohup do?

Runs a command that keeps running even after the terminal session is closed.

nohup command &

nohup ./long-script.sh &

What does nohup do?

nohup (no hangup) makes a command immune to the SIGHUP signal, so it continues running after you log out or close the terminal.

How do I run a command in the background permanently?

Use `nohup command &` to run a command that persists after logout. Output goes to nohup.out by default.

How do I redirect nohup output?

Use `nohup command > logfile.log 2>&1 &` to redirect both stdout and stderr to a specific log file.

How do I check if a nohup process is running?

Use `ps aux | grep commandname` or `pgrep commandname` to find running nohup processes.

How do I stop a nohup process?

Find the PID with `pgrep commandname` and then use `kill PID` or `kill -9 PID` to force stop it.

What is the difference between nohup and disown?

`nohup` prevents SIGHUP from terminating the command. `disown` removes a job from the shell's job table. Use both for maximum persistence.

How do I see nohup output?

Output is saved to nohup.out in the current directory. Use `cat nohup.out` or `tail -f nohup.out` to view it.

How do I run nohup with a script?

Use `nohup ./script.sh &` to run a script. Make sure the script is executable with `chmod +x script.sh` first.

Changes the priority (niceness) of an already running process.

Searches for processes by name and returns their PIDs.

Runs a command with a specified scheduling priority (niceness value).

Reports a snapshot of current running processes with their PIDs.

Lists active jobs (background and suspended processes) in the current shell.

Displays an interactive, real-time view of system processes and resource usage.