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Full Discussion: awk script: need help
Top Forums Shell Programming and Scripting awk script: need help Post 302977341 by bhupeshchavan on Saturday 16th of July 2016 06:53:35 AM
Old 07-16-2016
Hi Don,

Thank you very much for the explanation.

I got it , just for my understanding(like setting up values first and then evaluating it) i tried the below code and the output is fine, please check if this is the correct way to write or i should follow the RudiC's process of writing it.
Code:
awk '
/^time/ {HR = substr ($0, 6, 2)
        }
/eof/   {if (HR <= 12)   print TMP
         TMP = DL = ""
         next
        }
        {TMP = TMP DL $0
         DL  = ","
        }
' log

I believe that TMP keeps on adding the content to the TMP for the other lines until it finds eof. But when we use "TMP = TMP DL $0 DL=","", this is what i am still not sure about.
TMP=TMP means all the values till eof then why should we use DL and $0 after that .What does it mean to TMP.

Can we just TMP=TMP and set OFS="," at the beginning.I tried the below code but no output.
Code:
awk '
 BEGIN{OFS=","}
 /eof/   {if (HR <= 12)   print TMP
          TMP =""
          next
         }
         {TMP = TMP
         }
 /^time/ {HR = substr ($0, 6, 2)
         }
 ' log

Please help.

Thank you.
 

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LEARN ABOUT DEBIAN

deweb

deweb(1)						      General Commands Manual							  deweb(1)

NAME

       deweb - strips away C & CWEB commands from CWEB sources

SYNOPSIS

       deweb [ file1 file2 ...	]

DESCRIPTION

       deweb filters away all C & CWEB commands from a CWEB source code. This leaves only the LaTeX code. This stripped code, in turn, may then be
       passed to a suitable syntax checker for LaTeX, like ChkTeX and lacheck, or spell-checkers like ispell.

       The chkweb tool, included in the ChkTeX distribution will do just this; writing similar scripts should be trivial.

       When deweb strips away the C code from your CWEB source, it tries to preserve line breaks.  This means that the error reports   from  <your
       favorite  tool> will be correct regarding to line numbers. In most cases, the column position will also be correct. This significantly sim-
       plifies finding the errors in the LaTeX source (in contrast to the output from cweave, which output is truly difficult to  figure  anything
       out from).

       deweb  accepts  a list of filenames on the argument line, and will send its output to stdout.  If no filenames are given, it will read from
       stdin, acting as a filter. No options are currently accepted.

       Macho users may try to pipe the output from deweb directly into LaTeX, theoretically, this should work. This would ease	the  debugging	of
       the LaTeX code significantly, as when LaTeX complains about wrong syntax, you'll be able to find the erroneous line much more easily. Don't
       expect that the output looks very much like the final one, though.

       deweb should now understand all correct CWEB opcodes. If it complains about not understanding a correct opcode, please inform the author.

DISTRIBUTION

       Copyright (C) 1996 Jens T. Berger Thielemann

       This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as  published	by
       the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

       This  program  is  distributed  in  the	hope  that  it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MER-
       CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License along with this program; if not, write to the Free  Software  Foundation,
       Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

ENVIRONMENT

       No environment variables are used.

FILES

       None.

AUTHOR

       Jens T. Berger Thielemann, <jensthi@ifi.uio.no>

SEE ALSO

       cweave(1), perl(1), chktex, lacheck(1), ispell(1)

BUGS

       Doesn't	even  compile  under  Perl versions before perl v5. Unfortunately, this means that we can't even tell the user why we failed; Perl
       will just complain about not being able to compile the regexps.

       The program will try to swallow the whole input file at once, instead of processing it on a line-by-line basis.

7th Edition							   June 8, 1996 							  deweb(1)
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