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Full Discussion: format output from while read line
Top Forums UNIX for Dummies Questions & Answers format output from while read line Post 302176096 by bakunin on Monday 17th of March 2008 10:39:31 AM
Old 03-17-2008
Lets plan the whole thing a little, then it will be easier to understand:

1) we get information chunks and read them in the while-loop bit by bit. We have to set up a data structure to hold all the various pieces of information until we are ready to print it out wholly (to print a line).

2) There should be a certain condition defined for what makes the information "complete": is it that all the various pieces are there? (Have you "fields", which have to be filled and once all are filled the line is complete?) Is a line complete once a certain field is read? (in your case "OS version" is always the last field - is this what you intended or is this just by chance?)

3) What do you do with error conditions? What happens if you read i.e the following lines:

This is my client=2
client version=1.5.6
client version=1.6.7
OS version=6.7

or how about this:

This is my client=2
client version=1.5.6

You should be able to recognize such conditions and handle them somehow. Maybe incomplete records are OK (then you will have to find out somehow when an incomplete record ends), maybe they are not and your script should report an error.

Please answer these questions and then i will proceed to show you how this is implemented.

I hope this helps.

bakunin
 

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LEARN ABOUT X11R4

xpinputselected

XpInputSelected(3Xp)						 XPRINT FUNCTIONS					      XpInputSelected(3Xp)

NAME

       XpInputSelected - Queries which X Print events the client has selected to receive from the specific print context.

SYNOPSIS

	     cc [ flag... ] file... -lXp [ library... ]
	     #include <X11/extensions/Print.h>

       unsigned long XpInputSelected ( display, context, event_mask )
	     Display *display;
	     XPContext context;
	     unsigned long *all_event_mask_return;

ARGUMENTS

       display
	      Specifies a pointer to the Display structure; returned from XOpenDisplay.

       context
	      Specifies the print context to which the query is being made.

       all_event_mask_return
	      Returns the set of events that any client has selected.

DESCRIPTION

       XpInputSelected	returns  a  bit  mask  describing  which  event  classes  the  client  has  selected  to  receive.  The  value returned to
       all_event_mask_return is the union of every client's event mask.  XpInputSelected queries which X Print events  from  the  specified  print
       context	the  client  has  selected to receive. The X Print Events are generated from a print context, and not from a window as is the case
       with XSelectInput. As events arrive, the context field in the event is used to determine which print context generated the event.  See XpS-
       electInput for the event_mask and all_event_mask (??return??) values.

DIAGNOSTICS

       XPBadContext   The specified print context is not valid.

SEE ALSO

       XpSelectInput(3Xp)

X Version 11							    libXp 1.0.0 					      XpInputSelected(3Xp)
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