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Top Forums UNIX for Advanced & Expert Users Strange behavior from kill command Post 303037019 by cokedude on Sunday 21st of July 2019 12:41:33 AM
Old 07-21-2019
Strange behavior from kill command

I am getting some strange behaviour from the kill command. When I run the which command it says it points to /usr/bin/kill. When I look at my PATH I have /usr/bin in it. So why does running kill or /usr/bin/kill produce different outputs?

Code:
ghost ~
$ which kill
/usr/bin/kill

ghost ~
$ kill
kill: usage: kill [-s sigspec | -n signum | -sigspec] pid | jobspec ... or kill -l [sigspec]

ghost ~
$ /usr/bin/kill
Usage: kill [-f] [-signal] [-s signal] pid1 [pid2 ...]
       kill -l [signal]

Send signals to processes

 -f, --force     force, using win32 interface if necessary
 -l, --list      print a list of signal names
 -s, --signal    send signal (use kill --list for a list)
 -h, --help      output usage information and exit
 -V, --version   output version information and exit


Last edited by rbatte1; 07-23-2019 at 07:38 AM..
 

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KILL(1) 						    BSD General Commands Manual 						   KILL(1)

NAME
kill -- terminate or signal a process SYNOPSIS
kill [-s signal_name] pid ... kill -l [exit_status] kill -signal_name pid ... kill -signal_number pid ... DESCRIPTION
The kill utility sends a signal to the processes specified by the pid operand(s). Only the super-user may send signals to other users' processes. The options are as follows: -s signal_name A symbolic signal name specifying the signal to be sent instead of the default TERM. -l [exit_status] If no operand is given, list the signal names; otherwise, write the signal name corresponding to exit_status. -signal_name A symbolic signal name specifying the signal to be sent instead of the default TERM. -signal_number A non-negative decimal integer, specifying the signal to be sent instead of the default TERM. The following pids have special meanings: -1 If superuser, broadcast the signal to all processes; otherwise broadcast to all processes belonging to the user. Some of the more commonly used signals: 1 HUP (hang up) 2 INT (interrupt) 3 QUIT (quit) 6 ABRT (abort) 9 KILL (non-catchable, non-ignorable kill) 14 ALRM (alarm clock) 15 TERM (software termination signal) Some shells may provide a builtin kill command which is similar or identical to this utility. Consult the builtin(1) manual page. SEE ALSO
builtin(1), csh(1), killall(1), ps(1), kill(2), sigaction(2) STANDARDS
The kill function is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible. HISTORY
A kill command appeared in Version 6 AT&T UNIX. BUGS
A replacement for the command ``kill 0'' for csh(1) users should be provided. BSD
April 28, 1995 BSD
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