1# kill<a name="EN-US_TOPIC_0000001179965835"></a> 2 3- [Command Function](#section366714216619) 4- [Syntax](#section8833164614615) 5- [Parameters](#section12809111019453) 6- [Usage](#section15935131220717) 7- [Example](#section79281818476) 8- [Output](#section12742311179) 9 10## Command Function<a name="section366714216619"></a> 11 12This command is used to send a specific signal to a specified process. 13 14## Syntax<a name="section8833164614615"></a> 15 16kill \[_signo_ | _-signo_\] \[_pid_\] 17 18## Parameters<a name="section12809111019453"></a> 19 20**Table 1** Parameter description 21 22<a name="table438mcpsimp"></a> 23<table><thead align="left"><tr id="row444mcpsimp"><th class="cellrowborder" valign="top" width="21%" id="mcps1.2.4.1.1"><p id="p446mcpsimp"><a name="p446mcpsimp"></a><a name="p446mcpsimp"></a>Parameter</p> 24</th> 25<th class="cellrowborder" valign="top" width="51.92%" id="mcps1.2.4.1.2"><p id="p448mcpsimp"><a name="p448mcpsimp"></a><a name="p448mcpsimp"></a>Description</p> 26</th> 27<th class="cellrowborder" valign="top" width="27.08%" id="mcps1.2.4.1.3"><p id="p450mcpsimp"><a name="p450mcpsimp"></a><a name="p450mcpsimp"></a>Value Range</p> 28</th> 29</tr> 30</thead> 31<tbody><tr id="row451mcpsimp"><td class="cellrowborder" valign="top" width="21%" headers="mcps1.2.4.1.1 "><p id="p2500105121818"><a name="p2500105121818"></a><a name="p2500105121818"></a>signo</p> 32</td> 33<td class="cellrowborder" valign="top" width="51.92%" headers="mcps1.2.4.1.2 "><p id="p1149945111817"><a name="p1149945111817"></a><a name="p1149945111817"></a>Specifies the signal ID.</p> 34</td> 35<td class="cellrowborder" valign="top" width="27.08%" headers="mcps1.2.4.1.3 "><p id="p749810571812"><a name="p749810571812"></a><a name="p749810571812"></a>[1,30]</p> 36</td> 37</tr> 38<tr id="row113001232165611"><td class="cellrowborder" valign="top" width="21%" headers="mcps1.2.4.1.1 "><p id="p18301173213562"><a name="p18301173213562"></a><a name="p18301173213562"></a>pid</p> 39</td> 40<td class="cellrowborder" valign="top" width="51.92%" headers="mcps1.2.4.1.2 "><p id="p1730143212569"><a name="p1730143212569"></a><a name="p1730143212569"></a>Specifies the process ID.</p> 41</td> 42<td class="cellrowborder" valign="top" width="27.08%" headers="mcps1.2.4.1.3 "><p id="p1301193275618"><a name="p1301193275618"></a><a name="p1301193275618"></a>[1,MAX_INT]</p> 43</td> 44</tr> 45</tbody> 46</table> 47 48> **NOTICE:** 49>The valid range of the **signo** value is \[0, 64\], and the recommended value range is \[1, 30\]. Other values in the valid range are reserved. 50 51## Usage<a name="section15935131220717"></a> 52 53The **signo** and **pid** parameters are mandatory. 54 55The **pid** value range varies depending on the system configuration. For example, if the maximum **pid** value supported by the system is **256**, this value range is \[1-256\]. 56 57## Example<a name="section79281818476"></a> 58 591. Query the process list and determine the PID \(7\) of the process to be killed. 60 61**Figure 1** Querying PIDs<a name="fig6133125414256"></a> 62 63 642. Run **kill 14 7** to send signal 14 \(the default behavior of **SIGALRM** is to terminate the process\) to process 7 **helloworld\_d** \(user-space\). Then query the current process list. Process 7 has been terminated. The result of the **kill 14 7** command is the same as that of the **kill -14 7** command. 65 66**Figure 2** Command output<a name="fig2281711563"></a> 67 68 69## Output<a name="section12742311179"></a> 70 71The command output is as follows: 72 73**Figure 3** Sending a signal to a specified process<a name="fig11800272147"></a> 74 75 76The signal is successfully sent if no error is reported. 77 78**Figure 4** Signal sending failure<a name="fig24081235151813"></a> 79 80 81The signal fails to send due to invalid parameters. Check the signal ID and PID for fault. 82 83
