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Full Discussion: Echo/kill pgrep
Top Forums UNIX for Beginners Questions & Answers Echo/kill pgrep Post 303024504 by MadeInGermany on Wednesday 10th of October 2018 06:50:20 AM
Old 10-10-2018
The pipe symbol on the left means input.
But you want to pass the output to the kill command.
Then, the kill command works with arguments, not with an input stream. So you need the xargs program to convert the input stream to arguments.
Code:
pgrep foo | xargs kill

As mentioned, if pgrep does not find anything then kill complaints of missing arguments.
Therefore, and for the sake of simplicity:
Code:
pkill foo

 

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kill(1) 						      General Commands Manual							   kill(1)

Name
       kill - send a signal to a process

Syntax
       kill [-sig] processid...
       kill -l

Description
       The command sends the TERM (terminate, 15) signal to the specified processes.  If a signal name or number preceded by `-' is given as first
       argument, that signal is sent instead of terminate.  For further information, see

       The terminate signal kills processes that do not catch the signal; `kill -9 ...' is a sure kill, as the KILL (9) signal cannot  be  caught.
       By convention, if process number 0 is specified, all members in the process group (that is, processes resulting from the current login) are
       signaled.  This works only if you use and not if you use To kill a process it must either belong to you or you must be superuser.

       The process number of an asynchronous process started with `&' is reported by the shell.  Process numbers can also be  found  by  using	It
       allows job specifiers ``%...''  so process ID's are not as often used as arguments.  See for details.

Options
       -l   Lists  signal  names.  The signal names are listed by `kill -l', and are as given in /usr/include/signal.h, stripped of the common SIG
	    prefix.

See Also
       csh(1), ps(1), kill(2), sigvec(2)

																	   kill(1)
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