awk doesn't understand 'read' statement!!! Post: 302796857

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Top Forums Shell Programming and Scripting awk doesn't understand 'read' statement!!! Post 302796857 by ravisingh on Sunday 21st of April 2013 02:54:11 AM

04-21-2013

Banned

Don Cragun, that may be a good way to test our programs by giving standard input (without specifying any file name). I had run awk programs by giving stnd input.

Now, what I want to say is:
As many told that why I see a link between 'read' and 'continue/break', I also wondered why they wrote so. Because my 1st post reflects the connection. Based on the user input read by the read statement, either 'continue' is executed or 'break' is executed. See my codes, if user inputs 'y' , 'continue' is executed orelse 'break'. I hope this should show the connection.

Now , coming to the other point :--" what is the use of 'continue/break' if awk doesn't understand 'read' statement". You all are right to say that 'continue/break' is used in awk without user interference or without user input. The reason I told becz I have used programs which execute 'continue or break' based on the input as the example I gave you. so, I thought that if user input is not to be used, then the code doesn't need continue or break. If possible, may I expect anyone to give a small algorithm or example to show how without user input, 'continue/break' makes sense.

Alister thanks to say a way of reading stnd input. I will check how it works.

ravisingh

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LEARN ABOUT DEBIAN

break

break(3tcl)						       Tcl Built-In Commands						       break(3tcl)

__________________________________________________________________________________________________________________________________________________

NAME

       break - Abort looping command

SYNOPSIS

       break
_________________________________________________________________

DESCRIPTION

       This command is typically invoked inside the body of a looping command such as for or foreach or while.	It returns a TCL_BREAK code, which
       causes a break exception to occur.  The exception causes the current script to be aborted out to the  innermost	containing  loop  command,
       which  then aborts its execution and returns normally.  Break exceptions are also handled in a few other situations, such as the catch com-
       mand, Tk event bindings, and the outermost scripts of procedure bodies.

EXAMPLE

       Print a line for each of the integers from 0 to 5:
	      for {set x 0} {$x<10} {incr x} {
		 if {$x > 5} {
		    break
		 }
		 puts "x is $x"
	      }

SEE ALSO

       catch(3tcl), continue(3tcl), for(3tcl), foreach(3tcl), return(3tcl), while(3tcl)

KEYWORDS

       abort, break, loop

Tcl																       break(3tcl)