06-08-2017
I presume that:
- the script that you showed us that you're trying to kill is not the actual code that you're trying to kill,
- that you are not the author of the code you're trying to kill (since you didn't know the trap was there), and
- that you didn't consult with the author of that script before trying to write code to kill it
.
One obvious reason why someone would add a
trap command to ignore signals to a script that is expected to run for a while (i.e., more than a 1 instruction cycle) would be to keep scripts like yours from randomly killing them. Trying to ignore SIGSTOP and SIGKILL produces undefined results, but it is certainly a reasonable first attempt to keep a script running while the author of that script tracks down why their script is being terminated for no obvious reason.
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LEARN ABOUT CENTOS
service
service(8) System Manager's Manual service(8)
NAME
service - run a System V init script
SYNOPSIS
service SCRIPT COMMAND [OPTIONS]
service --status-all
service --help | -h | --version
DESCRIPTION
service runs a System V init script in as predictable environment as possible, removing most environment variables and with current working
directory set to /.
The SCRIPT parameter specifies a System V init script, located in /etc/init.d/SCRIPT. The supported values of COMMAND depend on the
invoked script, service passes COMMAND and OPTIONS it to the init script unmodified. All scripts should support at least the start and
stop commands. As a special case, if COMMAND is --full-restart, the script is run twice, first with the stop command, then with the start
command.
service --status-all runs all init scripts, in alphabetical order, with the status command.
If the init script file does not exist, the script tries to use legacy actions. If there is no suitable legacy action found and COMMAND is
one of actions specified in LSB Core Specification, input is redirected to the systemctl. Otherwise the command fails with return code 2.
FILES
/etc/init.d
The directory containing System V init scripts.
ENVIRONMENT
LANG, TERM
The only environment variables passed to the init scripts.
SEE ALSO
chkconfig(8), ntsysv(8), systemd(1), systemctl(8), systemd.service(5)
Jan 2006 service(8)