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Full Discussion: Use of exported variable
Top Forums Shell Programming and Scripting Use of exported variable Post 302736975 by vbe on Wednesday 28th of November 2012 08:56:47 AM
Old 11-28-2012
Code:
an12:/home/vbe $ echo $VAL   # VAL not set yet...

an12:/home/vbe $ echo $$
14811192                              #Begin SHELL PID
an12:/home/vbe $ ksh             # New SHELL
an12:/home/vbe $ echo $$
22544394                               # New SHELL PID
an12:/home/vbe $ export VAL=2:echo      # Variable VAL set now...
an12:/home/vbe $ echo $VAL
2:echo
an12:/home/vbe $ ksh             # Second New SHELL
an12:/home/vbe $ echo $$
21561462                                       # See PID is different...
an12:/home/vbe $ echo $VAL
2:echo                                   # And yes the variable was exported, so it this here...
an12:/home/vbe $ echo $$
21561462
an12:/home/vbe $ exit
an12:/home/vbe $ echo $$
22544394
an12:/home/vbe $ echo $VAL
2:echo
an12:/home/vbe $ exit
an12:/home/vbe $ echo $VAL    # Back to begin SHELL where has no knowledge of this variable...

an12:/home/vbe $ echo $$
14811192
an12:/home/vbe $

 

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LEARN ABOUT DEBIAN

restoredirvbe

RESTOREDIRVBE(3)					       MBK LOGICAL FUNCTIONS						  RESTOREDIRVBE(3)

NAME

       restoredirvbe - restore connectors directions from behavioral view

ORIGIN

       This  software  belongs	to  the  ALLIANCE CAD SYSTEM developed by the ASIM team at LIP6 laboratory of Universite Pierre et Marie CURIE, in
       Paris, France.

       Web : http://asim.lip6.fr/recherche/alliance/
       E-mail : alliance-users@asim.lip6.fr

SYNOPSYS

       #include "mlo.h"
       int restoredirvbe(ptfig)
       lofig_list *ptfig;

PARAMETER

       ptfig		   Pointer to a lofig_list

DESCRIPTION

       The restoredirvbe function read the PORT section of the vhdl behavuoiral view of the figure, restores the externals  connectors	directions
       and order them as indicated in the vbe.

RETURN VALUE

       restoredirvbe returns 1 on success, 0 if there is an error while reading the vbe file, -1 if their is no vbe.

ERROR

       "*** mbk error *** restoredirvbe : no figure given"
	      The ptfig parameter is NULL.
       "*** mbk error *** restoredirvbe : figure %s have more connectors than vbe"
	      Number  of connetors in vbe and in figure must be identical. If the vbe have more connectors, the getlocon function give an error on
	      the unknown connector.
       "*** mbk error *** restoredirvbe : cannot read port well!"
	      To restore the connectors directions, the vbe description must have a port well.
       "*** mbk error *** restoredirvbe : bit_vect neither to nor downto"
	      In a port section of a vbe, the bit vector must have indication of the sens of incrementation.

EXAMPLE

       #include "mut.h"
       #include "mlo.h"
       lofig_list * getgoodlofig(figname, mode)
       char *figname;
       char mode;
       {
       lofig_list *ptfig;
	  ptfig = getlofig(figname, mode);
	  restoredirvbe(ptfig);
	  return ptfig;
       }

SEE ALSO

       mbk(1), lofig(3), locon(3), getlofig(3),

BUG REPORT

       This tool is under development at the ASIM department of the LIP6 laboratory.
       We need your feedback to improve documentation and tools.

ASIM
/LIP6							  October 1, 1997						  RESTOREDIRVBE(3)
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