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Full Discussion: Sed: Working on a line Previous to a pattern.
Top Forums Shell Programming and Scripting Sed: Working on a line Previous to a pattern. Post 302431043 by mussen on Sunday 20th of June 2010 07:56:09 PM
Old 06-20-2010
Question Sed: Working on a line Previous to a pattern.
Hello everyone,

I am working with some train time tables, and i have hit a bit of a road block.

Using grep/sed i have done a reasonable job of parsing the html into comma delimited format, but NJ transit prints The Track number and status on a new line, and I would much prefer it all on a single line.

I more or less need to search for a line starting with a comma and then go to the previous line and remove the line break.

Let me show you where I am:

Code:
curl -silent http://dv.njtransit.com/mobile/tid-mobile.aspx?sid=NY |grep '<tr width="100%"' | sed 's/&nbsp;//g;s/<\/td>/,/g;s/<[^>]*>//g;s/  \/ /,/g;s/ to //g;/Track ,  ,/d;s/Track , /,/g;s/, /,/g'

Outputs....

Code:
7:00,A2257,Washington,AMTK,
,60 Min Late,
7:52,7673,Rahway,NEC,
Track 4,ALL ABOARD,
7:56,A165,Washington,AMTK,
,25 MINS LATE,
8:00,A2259,Washington,AMTK,
,15 MINS LATE,
8:02,7871,Trenton,NEC,
Track 7,BOARDING,
8:08,7273,Long Branch,NJCL,

I am a bit stumped and could really use a hand from some one with a bit more experience in such things.

Any advise would be greatly appreciated, Thanks guys!
 

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LEARN ABOUT XFREE86

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)
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