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Full Discussion: need to check if the process is running
Top Forums Shell Programming and Scripting need to check if the process is running Post 302548606 by Corona688 on Thursday 18th of August 2011 10:02:24 PM
Old 08-18-2011
awk doesn't know that anything's wrong, and you only get the return value of the last command.

It's traditional to have whatever runs a persistent program save its PID in a file, so you don't need to resort to ps | grep | awk | kitchen | sink tricks to find out what the PID is. This also allows systems where more than one instance of it can be run independently without interfering with each other.
 

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LEARN ABOUT DEBIAN

quickplot_shell

QUICKPLOT_SHELL(1)					      General Commands Manual						QUICKPLOT_SHELL(1)

NAME

       quickplot_shell - a remote command line shell for quickplot

SYNOPSIS

       Usage: quickplot_shell [PID]|[-h|--help]|[QUICKPLOT_OPTIONS]

DESCRIPTION

       Quickplot  is  an  interactive 2D plotter.  It's primary focus is to interactively display 2D plots.  quickplot_shell connects to a running
       Quickplot program.  quickplot_shell provides a command line interface for most of the graphical user interfaces that are in  the  Quickplot
       program.   quickplot_shell reads and writes to standard input and standard output respectively.	When standard input is a tty device quick-
       plot_shell enables readline tab completion and history.	If you would like to save your Quickplot shell history between sessions just  cre-
       ate a .quickplot_history in your home directory with a command like `touch ~/.quickplot_history'.

       If  the	argument option PID is not given, quickplot_shell will launch Quickplot as a new process and connect to that new process.  In this
       case Quickplot will be started with QUICKPLOT_OPTIONS if any are given.

       If PID is given, quickplot_shell will connect to a running Quickplot program with process ID PID.

       quickplot_shell sets up two named pipes, signals the running Quickplot program and writes commands and reads  responses	to  and  from  the
       pipe.  The named pipes will be unlinked as soon as they are connected, and hence will be removed automatically when the two programs are no
       longer running.

       quickplot_shell, the remote Quickplot shell, acts just like running quickplot --shell, a local Quickplot shell, but quickplot_shell runs as
       a  separate  process  and talks to the Quickplot program using pipes, where as quickplot --shell runs one process with both the GUI and the
       shell with no pipes.  You may connect as number of remote Quickplot shells to a Quickplot program.

       -h, --help
	      display help and exit

SEE ALSO

       quickplot(1)

COPYRIGHT

       Copyright (C) 1998-2011	Lance Arsenault

       Quickplot is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by  the
       Free Software Foundation, either version 3 of the License, or (at your option) any later version.

       Quickplot is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
       or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License along with Quickplot.	If not, see <http://www.gnu.org/licenses/>.

AUTHOR

       Lance Arsenault <lanceman@users.sourceforge.net>
       Send bug reports or comments to the above address.
       For more information, see the Quickplot homepage at
       <http://quickplot.sourceforge.net/>.

						Quickplot Version 0.10.3: 31 Jan 2012 03:27:29 UTC				QUICKPLOT_SHELL(1)
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