10+ Nohup 使い方 For You

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Introduction to Nohup

Nohup is a command-line tool that is commonly used in Unix-like operating systems such as Linux and macOS. It is used to run a command or script in the background even after the user logs out of the session. This is particularly useful when running long-running or resource-intensive tasks that can take several hours or days to complete.

Installing Nohup

Installing Nohup is a straightforward process. In most Linux distributions, it is already installed by default. However, if it is not installed, you can easily install it using the package manager. For example, on Debian or Ubuntu, you can use the following command:

sudo apt-get install nohup

Using Nohup

To use Nohup, you need to open a terminal and type in the command or script that you want to run. You then append the command with the "nohup" command, followed by an ampersand (&) to run the command in the background. For example:

nohup python my_script.py &

This command will run the "my_script.py" Python script in the background.

Redirecting Output

By default, Nohup redirects the output of the command or script to a file called "nohup.out" in the current directory. However, you can specify a different file name or location using the redirection operator (>). For example:

nohup python my_script.py > output.txt &

This command will redirect the output of the "my_script.py" script to a file called "output.txt".

Checking the Status of Nohup Jobs

You can check the status of Nohup jobs using the "jobs" command. This command displays a list of all the background jobs that are currently running. For example:

jobs

This command will display a list of all the background jobs that are currently running.

Killing Nohup Jobs

To kill a Nohup job, you need to first find its process ID using the "ps" command. Once you have the process ID, you can use the "kill" command to terminate the job. For example:

ps aux | grep my_script.py

kill PID

This command will find the process ID of the "my_script.py" script and terminate it.

Using Nohup with Cron

Nohup can also be used with the Cron scheduling tool to run periodic tasks. To do this, you need to specify the command or script that you want to run in a Cron job, and then append it with the "nohup" command. For example:

0 0 * * * nohup python my_script.py &

This command will run the "my_script.py" Python script at midnight every day.

Conclusion

Nohup is a powerful tool that can be used to run long-running or resource-intensive tasks in the background. It is easy to install and use, and it can be combined with other Unix tools to automate various tasks. With this comprehensive guide, you should now be able to use Nohup effectively in your day-to-day work.