Check Top Processes sorted by RAM or CPU Usage in Linux That said, let’s dive in and get started. Find Linux Processes By RAM and CPU Usage Continually adding commands to your own knowledge base is just as important.įor that reason, in this article we will share a trick to find out, which processes are consuming lots of Memory and CPU utilization in Linux. Part of automating your tasks, is learning how to get a script do what you would have to do yourself otherwise. Thus, they don’t have to babysit their servers and can use their time to learn new technologies and always stay at the top of their game. The reason is not that they’re not doing their job or wasting their time – it is mostly because they have automated a good deal of their routine tasks. Here’s an example of a process tree for an Apache webserver.I remember once reading that efficient system administrators are lazy people. To output the process IDs you use the -p flag. The pstree command can also output the process ID of each process in your tree. We can also see that the bash process has its own child, which is the pstree command we just executed. The child process are bash and sftp-server. pstree $PPID sshd─┬─bash───pstreeįrom the example above, we can see that the sshd process is our current Parent Process ID (PPID), and that it has two child processes. For example, to display a tree of child processes from the current parent process, you would run the following command. This command will output a tree of children processes of a parent process ID. pgrep -laP $PPIDįor a typical SSH parent the output will list the following processes 30797 -bashģ0798 /usr/lib/openssh/sftp-server Display Process TreeĪnother useful utility is the pstree command. With the parent process ID we can lookup all of the child process using of the parent using the pgrep command. ps -e | grep 9801 2029 ? 00:00:14 apache2 Listing Child Processes of a Parent Process ID Using the output from the ps command we can determine the name of the process. The output only contain the parent process ID itself. To determine the parent process of a specific process, we use the ps command. ps -e | grep $PPID Find the Parent Process ID of a Running Process To see what the parent process is we can use the ps command with the $PPID environment variable. The environment variable only outputs the process ID. echo $PPIDįor example, if you are SSH‘d into a Linux server, the value of the $PPID environment variable will the process ID of the SSH process. The parent process ID of your current context is exposed as an environment variable. A very helpful thing when you want to identify all of the children of a given parent, their IDs and names, which you may need when killing a process. We will also cover how to output a complete process tree of a parent process using the pstree command. You will also learn how to find the children of a given Parent Process ID using the ps command. In this quick tutorial, you are going to learn how to find the Parent Process ID in Linux from the command-line.
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