![]() ![]() ![]() You can also use the pgrep command to find the pid of the process you're looking for, by running $ pgrep -fl ssh In this example, the output shows that the ssh daemon process is running, the pid is 1027, parent pid is 1 and other details as well. This command uses the ps -ef command to list all running process, and pipes the output to grep ssh, that filters the output to show only the lines that contain the string "ssh". In this example, the output shows that the ssh daemon process is running and the pid is 1027Īnother way to find a specific process is − $ ps -ef | grep ssh This command uses the ps aux command to list all running processes, and pipes the output to grep ssh which filters the output to show only the lines that contain the string "ssh". Here's an example of how you can use the ps command to search for a specific process and display only the relevant information − $ ps aux | grep ssh You can use the ps command in conjunction with other commands, such as grep or awk to search for a specific process. TIME − The total CPU time consumed by the processĬOMMAND − The command that started the process START − The time when the process started TTY − The terminal associated with the process This command output shows the following information for each process − USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND Here is an example of using the ps aux command to list all running processes on a Linux system − $ ps aux Ps -eLf − It shows all processes in a tree format that show parent-child relationship as well as the thread of a process Ps -A − This command show all running processes, including those without a terminal controlling. The e option shows all processes and the f option displays the full format listing including the parent-child relationship of the processes. Ps -e or ps -ef − This command shows all processes on the system, including the processes without a controlling terminal. The a option shows processes for all users, the u option shows detailed information about the user running the process, and the x option shows processes that do not have a controlling terminal. Ps aux − This command shows all processes running on the system, including processes owned by other users. To list all processes running on a Linux or Unix-like system using the ps command, you can use one of the following command options and arguments − ![]() However, using various options and command line arguments, you can customize the output to show information about all processes running on the system, or even remotely. By default, ps only shows information about processes that are running in the same terminal session as the ps command. It provides a snapshot of the current processes, including the process ID (PID), the user that owns the process, the percentage of CPU and memory usage, and the command that started the process. See Bash FAQ 45 for other ways of locking.The ps command in Linux is used to display information about the running processes on a system. Trap 'rm -rf /tmp/abc.lock' EXIT # remove the lockdir on exit In this case, use a lockfile or a lockdir. I need to make sure only one instance of my script is running. See How can I check to see if my game server is still running. It can start the service automatically and keep track of it, and it can react when it dies. I want to ensure that service abc is running, and if not, start it That depends on what you need the test for. So how do I reliably test for a certain running process? There are various options you can apply to ps, grep and pgrep to narrow the search, but you still won't get a reliable test. Any user can easily create and run an executable named abc (or that contains abc somewhere in its name or arguments), causing a false positive for your test. Why?īecause you are not checking if a specific process is running, you are checking if there are any processes running that happens to match abc. Any solution that uses something like ps aux | grep abc or pgrep abc are flawed. ![]()
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