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landing/docs/Linux-Commands/Process-Management/034-the-kill-command.md

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+#  The `kill` command
+
+`kill` command in Linux (located in /bin/kill), is a built-in command which is used to terminate processes manually. The `kill` command sends a signal to a process which terminates the process. If the user doesn’t specify any signal which is to be sent along with kill command then default _TERM_ signal is sent that terminates the process.
+
+Signals can be specified in three ways:
+-   **By number (e.g. -5)**
+-   **With SIG prefix (e.g. -SIGkill)**
+-   **Without SIG prefix (e.g. -kill)**
+  
+### Syntax
+
+```
+kill [OPTIONS] [PID]...
+```
+
+###  Examples:
+1. To display all the available signals you can use below command option:
+
+```
+kill -l
+```
+
+2. To show how to use a _PID_ with the _kill_ command.
+
+```
+$kill pid
+```
+
+3. To show how to send signal to processes.
+```
+kill {-signal | -s signal} pid
+```
+
+4. Specify Signal:
+	
+- using numbers as signals 
+```
+kill -9 pid
+```
+- using SIG prefix in signals
+```
+kill -SIGHUP pid
+```
+- without SIG prefix in signals
+```
+kill -HUP pid
+```
+
+
+###  Arguments:
+The list of processes to be signaled can be a mixture of names and PIDs.
+
+       pid    Each pid can be expressed in one of the following ways:
+
+              n      where n is larger than 0.  The process with PID n is signaled.
+
+              0      All processes in the current process group are signaled.
+
+              -1     All processes with a PID larger than 1 are signaled.
+
+              -n     where n is larger than 1.  All processes in process group  n  are  signaled.
+                     When  an  argument  of  the  form '-n' is given, and it is meant to denote a
+                     process group, either a signal must be specified first, or the argument must
+                     be  preceded  by  a '--' option, otherwise it will be taken as the signal to
+                     send.
+
+       name   All processes invoked using this name will be signaled.
+###  Options:
+	   -s, --signal signal
+              The signal to send.  It may be given as a name or a number.
+
+       -l, --list [number]
+              Print a list of signal names, or convert the given signal number to  a  name.   The
+              signals can be found in /usr/include/linux/signal.h.
+
+       -L, --table
+              Similar to -l, but it will print signal names and their corresponding numbers.
+
+       -a, --all
+              Do  not  restrict the command-name-to-PID conversion to processes with the same UID
+              as the present process.
+
+       -p, --pid
+              Only print the process ID (PID) of the named processes, do not send any signals.
+
+       --verbose
+              Print PID(s) that will be signaled with kill along with the signal.
+
+