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Full Discussion: Remove blank lines
Top Forums Shell Programming and Scripting Remove blank lines Post 302459430 by DGPickett on Monday 4th of October 2010 04:15:43 PM
Old 10-04-2010
First sed cleans ends of lines of spaces and tabs (I show \t but I mean a real tab).
Second and third sed's are loopers with N, and so cannot share buffer with others.
Second sed removes the lonesome blank lines by examining three lines in the buffer.
Third sed removes adjacent blank lines by examining two lines in the buffer.

Code:
sed '
  s/[ \t][ \t]*$//
 ' | sed '
  :two
  $b
  N
  :one
  $b
  N
  s/\(.)\n\n\(.)/\1\
\2/
  t twox
  P
  s/.*\n//
  t one
  :twox
  P
  s/.*\n//
  t two
 ' | sed '
  :loop
  $b
  N
  /^\n$//!P
  s/.*\n//
  t loop
 '


---------- Post updated at 04:15 PM ---------- Previous update was at 04:14 PM ----------

The smiley is colon and lower case o.
Last edited by Scott; 10-04-2010 at 05:33 PM.. Reason: Code tags, please...
 

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LEARN ABOUT DEBIAN

fixnt

fixnt(1)							      Debian								  fixnt(1)

NAME

       fixnt - Filter for the Windows NT postscript printer driver.

SYNOPSIS

       fixnt < BADFILE.ps > GOODFILE.ps

DESCRIPTION

       The  Windows  NT  postscript  driver has a tendency to make broken postscript files, that are incompatible with psutils.  fixnt is a filter
       that fixes these problems, allowing the use of psnup(1).

       The filter takes the broken postscript file on stdin, and outputs a fixed postscript file on stdout.  It has no other form  for	invocation
       and takes no options on the command-line.

OPTIONS

       fixnt  takes no options.

BUGS

       fixnt does not check for NTPSOct94.  For a workaround, use a sed(1) command to replace 'NTPSOct94' with 'NTPSOct95', like so:
	      sed 's/NTPSOct94/NTPSOct95/g'
       This is particularly important for Windows NT 3.5 users.

AUTHOR

       fixnt   was   written   by   Holger   Bauer   <Holger.Bauer@topmail.de>,  Michael  Rath	<rath@itsm.uni-stuttgart.de>,  and  Akim  Demaille
       <demaille@inf.enst.fr>.

REPORTING BUGS

       Report bugs to the Authors, but avoid sending large postscript files.

       Patches are always welcome; send to <bauer@itsm.uni-stuttgart.de>.

SEE ALSO

       psnup(1), sed(1)

a2ps								   February 2003							  fixnt(1)
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