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Full Discussion: How to export a variable from a child process running in background to the parent
Top Forums Shell Programming and Scripting How to export a variable from a child process running in background to the parent Post 302258218 by demwz on Friday 14th of November 2008 04:35:55 AM
Old 11-14-2008
exported variables are inherited from parent to child and not the other way round.
Tough there is always a way shell ist not designed to do inter Process communication (IPC) this is normaly done by shared memory access or Unix domain sockets.
your example is quite simple bcs the child ends very fast.
echo $(./child.sh)
but if you want to acces data from a running child it gets complicated.
you may let the child write to a file or fifo which is read by the parrent.
 

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LEARN ABOUT HPUX

show_child

show child(1m)															    show child(1m)

NAME

       show child - Displays attribute information about the specified child pointer

SYNOPSIS

       cdscp show child child-name [attribute-name] [with attribute-name = attribute-value]

ARGUMENTS

       The  full  name of a specific child pointer.  The last simple name can contain wildcard characters.  The name of an attribute; see Descrip-
       tion for valid attribute names.	The value of a particular attribute.

DESCRIPTION

       The show child command displays the names and values of the  attributes	specified  in  attribute-name.	 You  can  use	a  combination	of
       attributes in a single command. Use a space to separate multiple attributes.  You can use a with attribute-name = attribute-value clause to
       limit output only to child pointers whose attributes have values equal to the specified values.	A space must  precede  and  follow  the  =
       (equals sign).

       If you do not supply any attributes, the command displays all attributes and their values.  The following is a description of child pointer
       attributes: Specifies the creation timestamp (CTS) of the specified child pointer.  Specifies the unique identifier  of	the  directory	to
       which  the child pointer refers.  Specifies the address, UUID, and name of a set of clearinghouses where a copy of the child directory ref-
       erenced by the child pointer is located. This attribute also specifies whether the directory in a particular clearinghouse is a	master	or
       read-only replica.  Specifies the timestamp of the most recent update to an attribute of the child pointer.

   Privilege Required
       You  must  have	read  permission  to the child pointer.  If you specify a wildcard child name, you also need read permission to the parent
       directory.

NOTE

       This command is replaced at Revision 1.1 by the dcecp command and may not be provided in future releases of DCE.

EXAMPLE

       The following command displays all of the attributes and values of the child directory to which the child pointer /.:/admin refers:  cdscp>
       show child /.:/admin

			       SHOW
			      CHILD   /.../abc.com/admin
				 AT   1991-10-15-15:56:01
			    CDS_CTS = 1991-10-15-19:55:52.000000003/08-00-2b-1c-8f-1f
			    CDS_UTS = 1991-10-15-19:55:52.000000006/08-00-2b-1c-8f-1f
		     CDS_ObjectUUID = 6b5362e8-8b1c-11ca-8981-08002b0f79aa
		       CDS_Replicas = :
	       Clearinghouse's UUID = 2ab024a8-8b1a-11ca-8981-08002b0f79aa
			      Tower = ncadg_ip_udp:16.18.16.32
			      Tower = ncacn_ip_tcp:16.18.16.32
		       Replica type = master
	       Clearinghouse's Name = /.../abc.com/Boston_CH

RELATED INFORMATION

       Commands: create child(1m), delete child(1m), list child(1m)

																    show child(1m)
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