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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

weatherrc

weatherrc(5)							File Formats Manual						      weatherrc(5)

NAME

       weatherrc - configuration file format for the weather(1) utility

DESCRIPTION

       The  weatherrc  file  format is intended to specify a set of aliases by which to group URIs for METAR station conditions and alert/forecast
       zones, but other command-line options and flags for the weather utility can be specified as well.  The file is organized as  an	INI-format
       config,	with  the  alias name in [] brackets and the associated parameter/value pairs on following lines.  Parameters and their values are
       separated by = or : characters.	Multi-word values do not need quoting.	These parameters are supported...

       alert  include local alert notices (possible values are False and True or 0 and 1)

       atypes list of alert notification types to display (ex: tornado_warning,urgent_weather_message)

       cache  control all caching (possible values are False and True or 0 and 1)

       cache_data
	      control retrieved data caching (possible values are False and True or 0 and 1)

       cache_search
	      control search result caching (possible values are False and True or 0 and 1)

       cacheage
	      duration in seconds to refresh cached data (ex: 900)

       cachedir
	      directory for storing cached searches and data (ex: ~/.weather)

       conditions
	      output current conditions (possible values are False and True or 0 and 1)

       defargs
	      list of default command-line arguments (ex: avl,rdu)

       forecast
	      include a local forecast (possible values are False and True or 0 and 1)

       headers
	      list of conditions headers to display (ex: temperature,wind)

       imperial
	      filter/convert conditions for US/UK units (possible values are False and True or 0 and 1)

       metric filter/convert conditions for metric units (possible values are False and True or 0 and 1)

       quiet  skip preambles and don't indent (possible values are False and True or 0 and 1)

       setpath
	      directory search path for correlation sets (ex: .:~/.weather)

       verbose
	      show full decoded feeds (possible values are False and True or 0 and 1)

EXAMPLES

       The following is an example ~/.weather/weatherrc defining a couple aliases named home and work to be displayed  when  running  the  utility
       with no aliases specified...

[default]
defargs = home,work

[home]
description = Conditions and Forecast at Home
forecast = True
metar = http://weather.noaa.gov/pub/data/observations/metar/decoded/KRDU.TXT
zone_forecast = http://weather.noaa.gov/pub/data/forecasts/zone/nc/ncz041.txt

[work]
description = Conditions at Work
metar = http://weather.noaa.gov/pub/data/observations/metar/decoded/KGSO.TXT

       Now if weather is invoked by itself on the command line, it will output conditions for home and work, and also a forecast for home only.

AUTHOR

       Specification and manual written by Jeremy Stanley <fungi@yuggoth.org>.

SEE ALSO

       weather(1)

2.0								    2012-06-24							      weatherrc(5)
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