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UNIX for Dummies Questions & Answers
Trying to block signal
Post 302465044 by DGPickett on Thursday 21st of October 2010 02:25:47 PM
10-21-2010
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Code:
KILL(1) Linux User's Manual KILL(1)
NAME
kill - send a signal to a process
SYNOPSIS
kill [ -signal | -s signal ] pid ...
kill [ -L | -V, --version ]
kill -l [ signal ]
DESCRIPTION
The default signal for kill is TERM. Use -l or -L to list available
signals. Particularly useful signals include HUP, INT, KILL, STOP,
CONT, and 0. Alternate signals may be specified in three ways: -9
-SIGKILL -KILL. Negative PID values may be used to choose whole pro-
cess groups; see the PGID column in ps command output. A PID of -1 is
special; it indicates all processes except the kill process itself and
init.
SIGNALS
The signals listed below may be available for use with kill. When
known constant, numbers and default behavior are shown.
Name Num Action Description
() ()
0 0 n/a exit code indicates if a signal may be sent
ALRM 14 exit
HUP 1 exit
INT 2 exit
KILL 9 exit this signal may not be blocked
PIPE 13 exit
POLL exit
PROF exit
TERM 15 exit
USR1 exit
USR2 exit
VTALRM exit
STKFLT exit may not be implemented
PWR ignore may exit on some systems
WINCH ignore
CHLD ignore
URG ignore
TSTP stop may interact with the shell
TTIN stop may interact with the shell
TTOU stop may interact with the shell
STOP stop this signal may not be blocked
.
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LEARN ABOUT REDHAT
kill
KILL(1) Linux Programmer's Manual KILL(1) NAME
kill - terminate a process SYNOPSIS
kill [ -s signal | -p ] [ -a ] [ -- ] pid ... kill -l [ signal ] DESCRIPTION
The command kill sends the specified signal to the specified process or process group. If no signal is specified, the TERM signal is sent. The TERM signal will kill processes which do not catch this signal. For other processes, it may be necessary to use the KILL (9) signal, since this signal cannot be caught. Most modern shells have a builtin kill function, with a usage rather similar to that of the command described here. The `-a' and `-p' options, and the possibility to specify pids by command name is a local extension. OPTIONS
pid... Specify the list of processes that kill should signal. Each pid can be one of five things: n where n is larger than 0. The process with pid n will be signaled. 0 All processes in the current process group are signaled. -1 All processes with pid larger than 1 will be 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 the signal must be specified first, or the argument must be preceded by a `--' option, otherwise it will be taken as the signal to send. commandname All processes invoked using that name will be signaled. -s signal Specify the signal to send. The signal may be given as a signal name or number. -l Print a list of signal names. These are found in /usr/include/linux/signal.h -a Do not restrict the commandname-to-pid conversion to processes with the same uid as the present process. -p Specify that kill should only print the process id (pid) of the named processes, and not send any signals. SEE ALSO
bash(1), tcsh(1), kill(2), sigvec(2), signal(7) AUTHOR
Taken from BSD 4.4. The ability to translate process names to process ids was added by Salvatore Valente <svalente@mit.edu>. Linux Utilities 14 October 1994 KILL(1)