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Full Discussion: Abnormality while piping tr command output to sed
Top Forums Shell Programming and Scripting Abnormality while piping tr command output to sed Post 302746643 by Scrutinizer on Wednesday 19th of December 2012 08:27:46 PM
Old 12-19-2012
@Don,

I agree with what you say and I know for a fact that some sed's do process that last line, other's don't so as you say the results are unspecified. However, I have never come across a version of awk that does not process that last unterminated line, and I am wondering why that might be. Even oawk on Solaris will process it:
Code:
$ printf "hello" | awk '{print}'
hello

Code:
$ printf "hello,hello" | awk '{print}' RS=,
hello
hello

Could it perhaps be that awk is almost 'obliged' to process that last line anyway because of the concept of RS, the input record separator which can be set to almost any character. So what might be a consequence of this is that any characters that follow that last RS, should be interpreted as being part of the last record? Otherwise it should have been called RT (Record Terminator)?

Another example would be that if the were not the case then from a UNIX point of view what this printf produces is a valid UNIX text file, but from an awk point of view - if you compare that to the situation where RS is a regular newline - this would be an "unterminated" last record
Code:
$ printf "hello,hello\n" | awk '{print}' RS=,
hello
hello

$

After all that last newline is not a file terminator, but a line terminator..
Last edited by Scrutinizer; 12-19-2012 at 09:55 PM..
 

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LEARN ABOUT CENTOS

paps

PAPS(1) 						      General Commands Manual							   PAPS(1)

NAME

       paps - UTF-8 to PostScript converter using Pango

SYNOPSIS

       paps [options] files...

DESCRIPTION

       paps reads a UTF-8 encoded file and generates a PostScript language rendering of the file. The rendering is done by creating outline curves
       through the pango ft2 backend.

OPTIONS

       These programs follow the usual GNU command line syntax, with long options starting with  two  dashes  (`-').   A  summary  of  options	is
       included below.

       --landscape
	      Landscape output. Default is portrait.

       --columns=cl
	      Number of columns output. Default is 1.

       --font=desc
	      Set the font description. Default is Monospace 12.

       --rtl  Do rtl layout.

       --paper ps
	      Choose paper size. Known paper sizes are legal, letter, a4. Default is A4.

       --bottom-margin=bm
	      Set bottom margin in postscript points (1/72 inch). Default is 36.

       --top-margin=tm
	      Set top margin. Default is 36.

       --left-margin=lm
	      Set left margin. Default is 36.

       --right-margin=rm
	      Set right margin. Default is 36.

       --help Show summary of options.

       --header
	      Draw page header for each page.

       --markup
	      Interpret the text as pango markup.

       --encoding=ENCODING
	      Assume the documentation encoding is ENCODING.

       --lpi  Set the lines per inch. This determines the line spacing.

       --cpi  Set the characters per inch. This is an alternative method of specifying the font size.

       --stretch-chars
	      Indicates  that  characters  should be stretched in the y-direction to fill up their vertical space. This is similar to the texttops
	      behaviour.

AUTHOR

       paps was written by Dov Grobgeld <dov.grobgeld@gmail.com>.

       This manual page was written by Lior Kaplan <kaplan@debian.org>, for the Debian project (but may be used by others).

								  April  17, 2006							   PAPS(1)
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