awk regexp to print repetitive pattern Post: 302977322

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Top Forums Shell Programming and Scripting awk regexp to print repetitive pattern Post 302977322 by Don Cragun on Friday 15th of July 2016 09:49:57 PM

07-15-2016

Registered User

I'm a little confused since the code you showed us is printing tabs between the hyphens in the output, but the sample output you provided from that command has four spaces at those spots instead of a singe tab. And, the output you showed us should have output lines in the order of the lines in file1, but it doesn't. It also seems strange that there are three trailing spaces on each line in your sample file2, but there are zero, two, or three spaces on the corresponding lines in your sample output. I don't know if that matters for the output you hope to produce, but it makes it hard to guess at what you are really trying to do???

So, with lots of unsupported guesswork, the following (combining earlier suggestions with your code to merge files and making the wild assumption that if you want tabs between hyphens, you might also want tab to be your output field separator) might or might not come close to producing the output you want:

Code:

awk '
NR==FNR {
	A[$2] = $0
	if(FNR == 1) {
		NFA = NF
		$0 = ""
		OFS = "-\t"
		$NFA = "-"
		dashes = $0
		OFS = "\t"
	}
	next
}
{	print $0, (($1 in A) ? A[$1] : dashes)
}' file2 file1

As always, if you want to try this on a Solaris/SunOS system, change awk to /usr/xpg4/bin/awk or nawk.

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LEARN ABOUT DEBIAN

shevek_regexp

shevek::regexp(3)					     Library Functions Manual						 shevek::regexp(3)

NAME

       shevek::regexp -

       Use regular expressions.

SYNOPSIS

       #include <regexp.hh>

   Public Member Functions
       regexp (std::string const &pattern=std::string(), bool case_sensitive=false)
	   Create a new object, and optionally fill it with a pattern.
       regexp & operator= (std::string const &pattern)
	   Set a pattern, removing the previous one.
       regexp (regexp const &that)
	   Copy a regexp.
       regexp & operator= (regexp const &that)
	   Copy a regexp.
       void case_sensitive (bool value=true)
	   Set whether the evaluation should be case sensitive.
       ~regexp ()
	   Destructor, this cleans up internal structures.
       bool operator() (std::string const &data)
	   Check whether the pattern matches a string, and fill internal match structures if it does.
       std::string operator[] (unsigned idx) const
	   Retrieve the value of a subexpression from the last matched string.
       bool valid (unsigned idx) const
	   Test whether a subexpression was filled by the last matching string.
       unsigned size () const
	   Get the number of subexpression.
       std::string transform (std::string const &data) const
	   Transform a string with -codes according to the last matching string.
       std::string const & pattern () const
	   Get the current pattern.

Detailed Description
       Use regular expressions.

Member Function Documentation
   std::string shevek::regexp::operator[] (unsignedidx) const
       Retrieve the value of a subexpression from the last matched string. This throws an exception if the subexpression is not valid.

Author
       Generated automatically by Doxygen for libshevek from the source code.

libshevek							  Fri May 11 2012						 shevek::regexp(3)

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