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Full Discussion: problem using sed to match a string
Top Forums Shell Programming and Scripting problem using sed to match a string Post 302560981 by huffpuff on Sunday 2nd of October 2011 05:34:31 PM
Old 10-02-2011
problem using sed to match a string
Hi There!

I'm stuck with a problem trying to output some sections of a rss feed to my conky program using curl and sed.

The rss feed is for tide times and I wish to output the times but not the rest to the conky desktop. To do this I need to pull out the four instances of times that are in the format of '00:00'. Since the digits will vary I have to match the sequence of two digits followed by a colon followed by two digits. This is what I tried so far:

Code:
#RSS Setup
URI=http://www.tidetimes.org.uk/southampton-tide-times.rss #URI of RSS Feed
LINES=1 #Number of headlines

#Environment Setup
EXEC="/usr/local/bin/curl -s" #Path to curl
TODAY=`date +%Y%m%d`
#Work Start
$EXEC $URI | grep description |\
sed -e 's/\([0-9]{2}:[0-9]{2}\)*/(&)/'

I have to admit my knowledge of sed is a bit shaky and the above has outputted a lot of gibberish. Any suggestions as to how I might pull out the four instances of the tide times in the format '00:00'?
 

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LEARN ABOUT CENTOS

repo-rss

repo-rss(1)															       repo-rss(1)

NAME

       repo-rss - generates an RSS feed from one or more Yum repositories

SYNOPSIS

       repo-rss [options] repoid1 [repoid2...]

DESCRIPTION

       repo-rss is a program for generating RSS feeds for one or more Yum repositories.

GENERAL OPTIONS

       -h, --help
	      Help; display a help message and then quit.

       -f <file>
	      Specify the file to which the RSS will be written.  Default is repo-rss.xml.

       -l <link>
	      Specify the URL to the RSS feed.	Default is http://yum.baseurl.org/.

       -t <title>
	      Specify the title for the RSS feed.  Default is "RSS Repository - Recent Packages".

       -d <description>
	      Specify the description of the RSS feed.	Default is "Most recent packages in Repositories".

       -r <days>
	      Specify the number of days to consider most recent.  Default is 3.

       --tempcache
	      Enable the use of a temporary directory for the yum cache.  This is enabled by default for non-root users.

EXAMPLES

       Generate an RSS for the updates-released repository and save it as updates-release.xml:
	      repo-rss -f updates-released.xml updates-released

FILES

       As repo-rss uses YUM libraries for retrieving all the information, it relies on YUM configuration for its default values like which reposi-
       tories to use. Consult YUM documentation for details:

       /etc/yum.conf
       /etc/yum/repos.d/
       /var/cache/yum/

SEE ALSO

       yum.conf (5)
       http://yum.baseurl.org/

AUTHORS

       See the Authors file included with this program.

BUGS

       There are of course no bugs, but should you find any, you should first consult the FAQ section on  http://yum.baseurl.org/wiki/Faq  and	if
       unsuccessful  in  finding a resolution contact the mailing list: yum-devel@lists.baseurl.org.  To file a bug use http://bugzilla.redhat.com
       for Fedora/RHEL/Centos related bugs and http://yum.baseurl.org/report for all other bugs.

Seth Vidal							       2005							       repo-rss(1)
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