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Full Discussion: Problem with a text file
Top Forums Shell Programming and Scripting Problem with a text file Post 302913382 by Don Cragun on Friday 15th of August 2014 09:49:13 PM
Old 08-15-2014
Quote:
Originally Posted by achenle
This will remove all empty lines:

Code:
grep -v '^$' file

Since the input is not a text file, the standards do not define the behavior of grep. On any system I've seen, this grep will remove the empty line. But on some systems it will add a trailing <newline> (as desired), and on other systems it will remove the partial line at the end of the file (not what the user wants).

From the description in the 1st message in this thread, it isn't obvious to me that the empty line at the start of the file is a problem. To me it sounded like there was an empty line at the start of the file, but the empty line wasn't the problem.

Making any change to the file in vi (such as x to delete a character and then u to undo the change) and then writing the file will cause most implementations of vi to add the missing trailing <newline>, but again, this is not required by the standards. (The behavior of vi is only specified when the file being edited is a text file.)
 

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LEARN ABOUT DEBIAN

strip_stx

strip_stx(1)						      General Commands Manual						      strip_stx(1)

NAME

       strip_stx - a simple literate programming tool

SYNOPSIS

       strip_stx [ -c commentchars ] [ -B open	close ] [ file	file ... ]

DESCRIPTION

       strip_stx  takes  all  structured  text (Stx) markup away from the listed files, leaving only text in preformatted blocks.  If no files are
       listed, standard input is read instead.	The result is written to standard output.

       This is intended as a simple literate programming tool: programmers may write their programs as documents, processing them with stx2any for
       documentation and publication but with strip_stx for compilation / running the code.

       More information about Stx is on the manpage of stx2any.

OPTIONS

	  -c commentchars
		 comment  out the non-code portions (text outside preformatted blocks) with the given commentchars at the beginning of every line.
		 If this option (or the next one) is not given, non-code portions are simply deleted.

	  -B open  close
		 surround the non-code portions with (comment-)opening and closing markers open and close respectively.  This option can  be  used
		 together with the -c option.

	  --version, -V
		 Just show version information and exit.

	  --help, -?
		 Just show a short help message and exit.

EXAMPLES

	       strip_stx parse.py.stx > parse.py

       Strip documentation away from the source file parse.py.stx, supposedly only leaving python code there.

	       strip_stx -B '/*' ' */' -c ' * ' my.c.stx > my.c

       Make a literate C code document into proper C source file, leaving the documentation in neatly-formatted comments.

	       strip_stx -B 'cat < < EOT' 'EOT' embshell.stx > embshell.sh

       Turn the document embshell.stx into an "embedded shell" script, where all non-program portions are printed to the standard output when exe-
       cution reaches them.  This is akin to PHP or eperl; but strip_stx is not really meant for this.	There are other options for making  embed-
       ded scripts, such as defining your own markup for the code portions or handling the program logic with m4 within stx2any.

SEE ALSO

       stx2any (1)

AUTHOR

       This page is written by Panu A. Kalliokoski.

Panu A. Kalliokoski														      strip_stx(1)
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