07-23-2019
I'm guessing which is an external command in your environment. As such it doesn't take into consideration builtin commands (which is why it is much better to use type on bash, ksh and dash). The reason for the difference in output from the two commands is they are literally two different commands. One is your shell's builtin command and the other is the system command.
Andrew
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kill.d(1m) USER COMMANDS kill.d(1m)
NAME
kill.d - snoop process signals as they occur. Uses DTrace.
SYNOPSIS
kill.d
DESCRIPTION
kill.d is a simple DTrace program to print details of process signals as they are sent, such as the PID source and destination, signal num-
ber and result.
This program can be used to determine which process is sending signals to which other process.
Since this uses DTrace, only users with root privileges can run this command.
EXAMPLES
Default output, print process signals as they are sent.
# kill.d
FIELDS
FROM source PID
COMMAND
source command name
TO destination PID
SIG destination signal ("9" for a kill -9)
RESULT result of signal (-1 is for failure)
DOCUMENTATION
See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with ver-
bose descriptions explaining the output.
EXIT
kill.d will run forever until Ctrl-C is hit.
AUTHOR
Brendan Gregg [Sydney, Australia]
SEE ALSO
dtrace(1M), truss(1)
version 0.90 May 14, 2005 kill.d(1m)