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Full Discussion: Variables scope.
Top Forums Shell Programming and Scripting Variables scope. Post 302198021 by namishtiwari on Thursday 22nd of May 2008 05:30:43 AM
Old 05-22-2008
Quote:
Originally Posted by dinjo_jo
Hi ,
I'm trying to change the variable value in a while loop , however its not working it seems that the problem with subshells while reading the file.

#!/bin/sh
FLAG=0;
cat filename | while read data
do
FLAG=1;
done

echo $FLAG

Should display 1 instead displays 0
It will only display the value of FLAG as 1 when the condition is satisfied,that means there is some file you are trying to cat and reading lines. So check for the file first.

Thanks..
 

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LEARN ABOUT CENTOS

systemd.scope

SYSTEMD.SCOPE(5)						   systemd.scope						  SYSTEMD.SCOPE(5)

NAME

       systemd.scope - Scope unit configuration

SYNOPSIS

       scope.scope

DESCRIPTION

       Scope units are not configured via unit configuration files, but are only created programmatically using the bus interfaces of systemd.
       They are named similar to filenames. A unit whose name ends in ".scope" refers to a scope unit. Scopes units manage a set of system
       processes. Unlike service units, scope units manage externally created processes, and do not fork off processes on its own.

       The main purpose of scope units is grouping worker processes of a system service for organization and for managing resources.

       systemd-run --scope may be used to easily launch a command in a new scope unit from the command line.

       See the New Control Group Interfaces[1] for an introduction how to make use of scope units from programs.

       Unless DefaultDependencies=false is used, scope units will implicitly have dependencies of type Conflicts= and Before= on shutdown.target.
       These ensure that scope units are removed prior to system shutdown. Only scope units involved with early boot or late system shutdown
       should disable this option.

SEE ALSO

       systemd(1), systemd-run(1), systemd.unit(5), systemd.resource-control(5), systemd.service(5), systemd.directives(7).

NOTES

	1. New Control Group Interfaces
	   http://www.freedesktop.org/wiki/Software/systemd/ControlGroupInterface/

systemd 208															  SYSTEMD.SCOPE(5)
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