{"id":5819,"date":"2023-06-20T16:22:10","date_gmt":"2023-06-20T16:22:10","guid":{"rendered":"https:\/\/www.webhi.com\/how-to\/?p=5819"},"modified":"2023-06-20T16:22:12","modified_gmt":"2023-06-20T16:22:12","slug":"process-management-linux-guide-to-use-ps-kill-nice","status":"publish","type":"post","link":"https:\/\/www.webhi.com\/how-to\/process-management-linux-guide-to-use-ps-kill-nice\/","title":{"rendered":"Process Management in Linux: A Guide to use ps,\u00a0kill, and\u00a0nice"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1200\" height=\"675\" src=\"https:\/\/www.webhi.com\/how-to\/gilrogre\/2023\/06\/ps_kill_nice_en.jpg\" alt=\"Process Management in Linux Unix Guide Using\u00a0ps\u00a0kill nice\" class=\"wp-image-5852\" srcset=\"https:\/\/www.webhi.com\/how-to\/gilrogre\/2023\/06\/ps_kill_nice_en.jpg 1200w, https:\/\/www.webhi.com\/how-to\/gilrogre\/2023\/06\/ps_kill_nice_en-300x169.jpg 300w, https:\/\/www.webhi.com\/how-to\/gilrogre\/2023\/06\/ps_kill_nice_en-1024x576.jpg 1024w, https:\/\/www.webhi.com\/how-to\/gilrogre\/2023\/06\/ps_kill_nice_en-768x432.jpg 768w, https:\/\/www.webhi.com\/how-to\/gilrogre\/2023\/06\/ps_kill_nice_en-150x84.jpg 150w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"introduction\">Introduction<\/h2>\n\n\n\n<p>In the Linux operating system, managing processes is an essential task for system administrators and users alike. Whether you need to monitor running processes, terminate unwanted ones, or adjust their execution priority, several powerful command-line utilities come to the rescue:\u00a0<code><strong>ps<\/strong><\/code>,\u00a0<code><strong>kill<\/strong><\/code>, and\u00a0<code><strong>nice<\/strong><\/code>. In this article, we will explore how to effectively use these commands to manage processes in Linux.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-understanding-the-ps-command\">I. Understanding the&nbsp;<code>ps<\/code>&nbsp;Command<\/h2>\n\n\n\n<p>The&nbsp;<code>ps<\/code>&nbsp;command stands for &#8220;process status&#8221; and is used to provide information about the currently running processes in a Linux system. By default, the&nbsp;<code>ps<\/code>&nbsp;command displays the processes associated with the current user. Here&#8217;s how you can utilize&nbsp;<code>ps<\/code>&nbsp;effectively:<\/p>\n\n\n\n<ol>\n<li>Viewing Basic Process Information<\/li>\n<\/ol>\n\n\n\n<p>To obtain a list of running processes along with their basic details, open a terminal and type:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"bash\" class=\"language-bash\">$ ps aux<\/code><\/pre>\n\n\n\n<p>This command will display a table with columns representing process ID (PID), CPU and memory usage, user, command, and more.<\/p>\n\n\n\n<ol start=\"2\">\n<li>Filtering Processes<\/li>\n<\/ol>\n\n\n\n<p>You can filter the process list to display only specific processes using various options. For example:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"bash\" class=\"language-bash\">$ ps -ef | grep &lt;process_name&gt;<\/code><\/pre>\n\n\n\n<p>This command will list the processes that match the given&nbsp;<code>&lt;process_name&gt;<\/code>. The&nbsp;<code>grep<\/code>&nbsp;command is used to search for specific keywords in the&nbsp;<code>ps<\/code>&nbsp;output.<\/p>\n\n\n\n<ol start=\"3\">\n<li>Monitoring Processes in Real-time<\/li>\n<\/ol>\n\n\n\n<p>To continuously monitor processes and update the output dynamically, you can use the following command:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"bash\" class=\"language-bash\">$ watch -n 1 'ps aux'<\/code><\/pre>\n\n\n\n<p>This command will refresh the process list every second, providing an up-to-date view of the running processes.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"ii-killing-processes-with-the-kill-command\">II. Killing Processes with the&nbsp;<code>kill<\/code>&nbsp;Command<\/h2>\n\n\n\n<p>Once you identify the process that needs to be terminated, the&nbsp;<code>kill<\/code>&nbsp;command comes into play. It allows you to send various signals to processes, requesting them to terminate gracefully or forcefully. Here&#8217;s how you can utilize the&nbsp;<code>kill<\/code>&nbsp;command effectively:<\/p>\n\n\n\n<ol>\n<li>Terminating Processes Gracefully<\/li>\n<\/ol>\n\n\n\n<p>To terminate a process gracefully, you can use the following command:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"bash\" class=\"language-bash\">$ kill &lt;PID&gt;<\/code><\/pre>\n\n\n\n<p>Replace&nbsp;<code>&lt;PID&gt;<\/code>&nbsp;with the process ID of the target process. By default, the&nbsp;<code>kill<\/code>&nbsp;command sends the SIGTERM signal, requesting the process to exit gracefully.<\/p>\n\n\n\n<ol start=\"2\">\n<li>Forcibly Killing Processes<\/li>\n<\/ol>\n\n\n\n<p>In some cases, a process may not respond to the SIGTERM signal. In such situations, you can send the SIGKILL signal to forcefully terminate the process using the&nbsp;<code>-9<\/code>&nbsp;option with the&nbsp;<code>kill<\/code>&nbsp;command:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"bash\" class=\"language-bash\">$ kill -9 &lt;PID&gt;<\/code><\/pre>\n\n\n\n<p>Note that this option should be used as a last resort, as it does not allow the process to perform any cleanup operations.<\/p>\n\n\n\n<ol start=\"3\">\n<li>Killing Multiple Processes<\/li>\n<\/ol>\n\n\n\n<p>If you need to terminate multiple processes simultaneously, you can specify their process IDs separated by spaces:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"bash\" class=\"language-bash\">$ kill &lt;PID1&gt; &lt;PID2&gt; &lt;PID3&gt;<\/code><\/pre>\n\n\n\n<p>This command will send the SIGTERM signal to each process, allowing them to exit gracefully.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"iii-using-nice-to-adjust-process-priority\">III. Using&nbsp;<code>nice<\/code>&nbsp;to Adjust Process Priority<\/h2>\n\n\n\n<p>The&nbsp;<code>nice<\/code>&nbsp;command is used to adjust the execution priority of processes. By assigning different priority levels, you can control the allocation of CPU resources to processes. Here&#8217;s how you can use&nbsp;<code>nice<\/code>&nbsp;effectively:<\/p>\n\n\n\n<ol>\n<li>Setting Process Priority<\/li>\n<\/ol>\n\n\n\n<p>To start a new process with a specific priority, you can use the following command:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"bash\" class=\"language-bash\">$ nice -n &lt;priority&gt; &lt;command&gt;<\/code><\/pre>\n\n\n\n<p>Replace&nbsp;<code>&lt;priority&gt;<\/code>&nbsp;with the desired value (typically between -20 and 19, where lower values indicate higher priority) and&nbsp;<code>&lt;command&gt;<\/code>&nbsp;with the command you want to execute.<\/p>\n\n\n\n<ol start=\"2\">\n<li>Changing Process Priority<\/li>\n<\/ol>\n\n\n\n<p>If a process is already running and you want to change its priority, you can use the&nbsp;<code>renice<\/code>&nbsp;command. For example:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"bash\" class=\"language-bash\">$ renice -n &lt;priority&gt; -p &lt;PID&gt;<\/code><\/pre>\n\n\n\n<p>Replace&nbsp;<code>&lt;priority&gt;<\/code>&nbsp;with the new priority value and&nbsp;<code>&lt;PID&gt;<\/code>&nbsp;with the process ID of the target process.<\/p>\n\n\n\n<ol start=\"3\">\n<li>Checking Process Priority<\/li>\n<\/ol>\n\n\n\n<p>To check the priority of a running process, you can use the&nbsp;<code>ps<\/code>&nbsp;command in combination with the&nbsp;<code>nice<\/code>&nbsp;value. For example:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"bash\" class=\"language-bash\">$ ps -eo pid,ni,cmd<\/code><\/pre>\n\n\n\n<p>This command will display the process ID, nice value, and command for each process.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"iv-advanced-usage-and-additional-options\">IV. Advanced Usage and Additional Options<\/h2>\n\n\n\n<p>The&nbsp;<code>ps<\/code>,&nbsp;<code>kill<\/code>, and&nbsp;<code>nice<\/code>&nbsp;commands offer additional options for more advanced process management:<\/p>\n\n\n\n<ol>\n<li>Custom Output Format with&nbsp;<code>ps<\/code><\/li>\n<\/ol>\n\n\n\n<p>You can customize the output format of the&nbsp;<code>ps<\/code>&nbsp;command using the&nbsp;<code>--format<\/code>&nbsp;option. For example:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"bash\" class=\"language-bash\">$ ps --format \"&lt;format_specifiers&gt;\"<\/code><\/pre>\n\n\n\n<p>This command allows you to specify the desired columns and their order in the output.<\/p>\n\n\n\n<ol start=\"2\">\n<li>Process Tree View with&nbsp;<code>ps<\/code><\/li>\n<\/ol>\n\n\n\n<p>To view processes in a hierarchical tree structure, use the&nbsp;<code>pstree<\/code>&nbsp;command in conjunction with&nbsp;<code>ps<\/code>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"bash\" class=\"language-bash\">$ pstree -p &lt;PID&gt;<\/code><\/pre>\n\n\n\n<p>This command will display the process tree starting from the process with the specified&nbsp;<code>&lt;PID&gt;<\/code>.<\/p>\n\n\n\n<ol start=\"3\">\n<li>Sending Different Signals with&nbsp;<code>kill<\/code><\/li>\n<\/ol>\n\n\n\n<p>The&nbsp;<code>kill<\/code>&nbsp;command can send signals other than SIGTERM and SIGKILL. For example, to request a process to reload its configuration, you can send the SIGHUP signal using the following command:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"bash\" class=\"language-bash\">$ kill -HUP &lt;PID&gt;<\/code><\/pre>\n\n\n\n<p>Refer to the&nbsp;<code>kill<\/code>&nbsp;command&#8217;s manual page for more signal options.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"conclusion\">Conclusion<\/h2>\n\n\n\n<p>The&nbsp;<code>ps<\/code>,&nbsp;<code>kill<\/code>, and&nbsp;<code>nice<\/code>&nbsp;commands are powerful tools for managing processes in Linux. With&nbsp;<code>ps<\/code>, you can monitor running processes, filter the output, and view process hierarchies. The&nbsp;<code>kill<\/code>&nbsp;command allows you to terminate processes gracefully or forcefully, while&nbsp;<code>nice<\/code>&nbsp;enables you to adjust process priority. By mastering these commands and their options, you can efficiently manage processes in your Linux system and ensure optimal performance.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction In the Linux operating system, managing processes is an essential task for system administrators and users alike. Whether you need to monitor running processes, terminate unwanted ones, or adjust their execution priority, several powerful command-line utilities come to the rescue:\u00a0ps,\u00a0kill, and\u00a0nice. In this article, we will explore how to effectively use these commands to ..<\/p>\n<div class=\"clear-fix\"><\/div>\n<p><a href=\"https:\/\/www.webhi.com\/how-to\/process-management-linux-guide-to-use-ps-kill-nice\/\" title=\"read more...\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[69],"tags":[],"yoast_head":"\n<title>Process Management in Linux: A Guide to use ps,\u00a0kill, and\u00a0nice - WebHi Tutorials &amp; Documentations<\/title>\n<meta name=\"description\" content=\"Learn how to effectively manage processes in Linux using commands like ps, kill, and nice. 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