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Bash command line ps ef11/7/2023 ![]() ![]() As you can see below, the first column contains the PID. The default output of ps is a simple list of the processes running in your current terminal. There are several commands that can check the status of a running process. We can also use the process name, as I'll demonstrate below. This number is what we use to manage each process. Manage a running processĮach process is given a unique process identification number (PID). One nice thing nohup does is return the running process's PID. For example, suppose you want to run myprogram.sh. Also, appending an ampersand (&) will send the process to the background and allow you to continue using the terminal. This special case can be avoided by preceding the command you want to run with the nohup command. Nginx version: nginx/1.14.0 Keeping a process running NOHUPĪ process may not continue to run when you log out or close your terminal. Now, repeat your echo and which commands or try to check the version. For example, Bash users would need to edit the PATH= line in their. The third solution is to update your executable path environment variable to include the directory where the specific application you want to use is installed. ![]() However, this may not be possible, particularly if you don't have root privileges. The second solution would be to install the application in a directory in your executable's path. 10 command-line tools for data analysis in Linux. ![]() Although, I'd rather not have to type all of that, would you? /home/alan/web/prod/nginx/sbin/nginx -v There are three ways to remedy a situation where a process cannot be started simply by name. If the command which nginx returns nothing, then Nginx was not found because which searches only your defined executable path. I will use the popular web server software Nginx for my examples. Use the which command to view the full path of an executable file. usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin WHICH You can view your executable path using echo $PATH. Administrators often customize this path for their desired purpose. Understanding this path is key to reliably starting and managing a process. The above demonstration of starting a process assumes the executable file is located in your executable path. Nginx version: nginx/1.14.0 Viewing your executable path Perhaps you just want to check the version. If you want to start an Nginx web server, type nginx. The easiest way to start a process is to type its name at the command line and press Enter. These eight commands can be used to manage processes through their lifecycles. Each state can and should be managed carefully if we want to be competent administrators. If you want to stop the command, press Ctrl + C.Generally, an application process' lifecycle has three main states: start, run, and stop.
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