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Full Discussion: Removing punctuations from file input or standard input
Homework and Emergencies Homework & Coursework Questions Removing punctuations from file input or standard input Post 302894378 by fozilla on Tuesday 25th of March 2014 07:13:20 AM
Old 03-25-2014
Quote:
Originally Posted by bakunin
In principle: yes, but as you want to implement the "-r" option you need to break down this class to its member characters anyway.

You might want to start with the following thought: how does a script receive input? There are two ways: via <stdin> and via a file it reads from. If you use:

Code:
yourscript -f /path/to/file

The script is supposed to open that file and get its input by reading from it. If - in opposition to that - you use

Code:
cat /path/to/file | yourscript

or

Code:
yourscript < /path/to/file

The script gets its input by reading from <stdin>. You should start by researching and understanding how a script gathers input in these two ways prior to changing this input.

I hope this helps.

bakunin
I see. I was thinking of using an if else statement to check whether if there is an argument for the command or not. If there is an argument, then the command would use that argument, which is the file input. If there is none, then it is through standard input.

Is this fine?


Regards.
Last edited by fozilla; 03-25-2014 at 08:34 AM..
 

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LEARN ABOUT DEBIAN

receive

term::receive(3tcl)						 Terminal control					       term::receive(3tcl)

__________________________________________________________________________________________________________________________________________________

NAME

       term::receive - General input from terminals

SYNOPSIS

       package require Tcl  8.4

       package require term::receive  ?0.1?

       ::term::receive::getch ?chan?

       ::term::receive::listen cmd ?chan?

       cmd process string

       cmd eof

       ::term::receive::unlisten ?chan?

_________________________________________________________________

DESCRIPTION

       This  package  provides	the most primitive commands for receiving characters to a terminal. They are in essence convenient wrappers around
       the builtin commands read and fileevent.

       ::term::receive::getch ?chan?
	      This command reads a single character from the channel with handle chan and returns it as the result of the command.

	      If not specified chan defaults to stdin.

	      It is the responsibility of the caller to make sure that the channel can provide single characters. On unix this can  be	done,  for
	      example, by using the command of package term::ansi::ctrl::unix.

       ::term::receive::listen cmd ?chan?
	      This  command  sets  up  a filevent listener for the channel with handle chan and invokes the command prefix cmd whenever characters
	      have been received, or EOF was reached.

	      If not specified chan defaults to stdin.

	      The signature of the command prefix is

	      cmd process string
		     This method is invoked when characters were received, and string holds them for processing.

	      cmd eof
		     This method is invoked when EOF was reached on the channel we listen on.  It will be the last call  to  be  received  by  the
		     callback.

       ::term::receive::unlisten ?chan?
	      This command disables the filevent listener for the channel with handle chan.

	      If not specified chan defaults to stdin.

BUGS, IDEAS, FEEDBACK
       This  document, and the package it describes, will undoubtedly contain bugs and other problems.	Please report such in the category term of
       the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883].  Please also report any ideas for enhancements you  may  have  for
       either package and/or documentation.

KEYWORDS

       character input, control, get character, listener, receiver, terminal

CATEGORY

       Terminal control

COPYRIGHT

       Copyright (c) 2006 Andreas Kupries <andreas_kupries@users.sourceforge.net>

term									0.1						       term::receive(3tcl)
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