Doubt in the daemon running script Post: 302441684

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Top Forums Shell Programming and Scripting Doubt in the daemon running script Post 302441684 by mani_isha on Monday 2nd of August 2010 04:17:18 AM

08-02-2010

Registered User

Doubt in the daemon running script

Hi
I was going through one of my pjct script .Please let me know the logic for the deamon is running or not as i think the condtn should be vice-versa.

Code:

daemon_list = 'idp1278'
FAIL=0
for p in ${daemon_list}
do
  fail=0
  ps -fu  workarea  | grep ${p} > /dev/null 2>&1
  if [[ $? -ne 0 ]] then
    fail=1
    msg="${p} daemon is down"
    print -n "${p} is down"
  else
    msg="${p} daemon is up"
    print -n "${p} is up"
  fi

**where workarea is the hostname .
idp1278 i sthe daemon name .

when the process is running ,it is showing as below command :

Code:

ps -fu  workarea  | grep ${p} ->where $p is dp1278
 
workarea 28907 5374 1 02:41:54 pts/14 0:00 grep idp1278 workarea 6058 1 0 00:05:21 ? 0:00 ptr_DmnEnvelope idp1278L idp1278daemon_Sh.

My doubt i s:
1>when ? is coming the process is running actually but in the script it is wriiten if [? is !0 ]then daemon not running .. .what is the actual logic to check the daemon running .

2>ps -fu workarea | grep ${p}/dev/null 2>&1
where $p is idp1278 .

when i executedthe above script nothing came and it took me to next command prompt.At this time the idp12278 daem,on was running in my env .

Also please let me know why this command is used /dev/null 2>&1

Last edited by pludi; 08-02-2010 at 05:49 AM..

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dh_systemd_start

DH_SYSTEMD_START(1)						     Debhelper						       DH_SYSTEMD_START(1)

NAME

       dh_systemd_start - start/stop/restart systemd unit files

SYNOPSIS

       dh_systemd_start [debhelperoptions] [--restart-after-upgrade] [--no-stop-on-upgrade] [unitfile...]

DESCRIPTION

       dh_systemd_start is a debhelper program that is responsible for starting/stopping or restarting systemd unit files in case no corresponding
       sysv init script is available.

       As with dh_installinit, the unit file is stopped before upgrades and started afterwards (unless --restart-after-upgrade is specified, in
       which case it will only be restarted after the upgrade).  This logic is not used when there is a corresponding SysV init script because
       invoke-rc.d performs the stop/start/restart in that case.

OPTIONS

       --restart-after-upgrade
	   Do not stop the unit file until after the package upgrade has been completed.  This is the default behaviour in compat 10.

	   In earlier compat levels the default was to stop the unit file in the prerm, and start it again in the postinst.

	   This can be useful for daemons that should not have a possibly long downtime during upgrade. But you should make sure that the daemon
	   will not get confused by the package being upgraded while it's running before using this option.

       --no-restart-after-upgrade
	   Undo a previous --restart-after-upgrade (or the default of compat 10).  If no other options are given, this will cause the service to
	   be stopped in the prerm script and started again in the postinst script.

       -r, --no-stop-on-upgrade, --no-restart-on-upgrade
	   Do not stop service on upgrade.

       --no-start
	   Do not start the unit file after upgrades and after initial installation (the latter is only relevant for services without a
	   corresponding init script).

NOTES

       Note that this command is not idempotent. dh_prep(1) should be called between invocations of this command (with the same arguments).
       Otherwise, it may cause multiple instances of the same text to be added to maintainer scripts.

       Note that dh_systemd_start should be run after dh_installinit so that it can detect corresponding SysV init scripts. The default sequence
       in dh does the right thing, this note is only relevant when you are calling dh_systemd_start manually.

SEE ALSO

       debhelper(7)

AUTHORS

       pkg-systemd-maintainers@lists.alioth.debian.org

11.1.6ubuntu2							    2018-05-10						       DH_SYSTEMD_START(1)

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