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Full Discussion: sed: print out to first blank line
Top Forums Shell Programming and Scripting sed: print out to first blank line Post 302268534 by bakunin on Monday 15th of December 2008 08:52:50 PM
Old 12-15-2008
Quote:
Originally Posted by lagagnon
How can I change the sed portion of above to stop at what appears to be a blank line in the text?
I remember searching for a solution to a similar problem some years ago. When i finally found the answer it stunned me because of its simplicity. The trick is to simply quit sed when encountering the line on which you want to stop. Consider the following file:

Code:
# some text
# some text
# some text

# some other text
# some other text

If you want to stop at the blank line (for the purpose of the example we suppose it is completely empty) issue the following sed script:

Code:
sed '/^$/q' infile > outfile

Btw: my problem was to extract "headers" from script files. Usually a script has one or several lines at the beginning that start with a octothorpe ("#"). After these come lines with normal script code and then maybe the one or other commentary line starting with an octothorpe again. I wanted to extract only the first "header" lines, not any commentary after the first noncommentary line. My solution was analogous.

I hope this helps.

bakunin
 

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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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