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Full Discussion: AWK: Backslash \ and forcing output not to go onto new lines
Top Forums UNIX for Dummies Questions & Answers AWK: Backslash \ and forcing output not to go onto new lines Post 302392792 by ingli on Friday 5th of February 2010 12:45:46 PM
Old 02-05-2010
AWK: Backslash \ and forcing output not to go onto new lines
Dear all,
I am using Mac OSX, have been successfully written an awk script during the last days. I use the script to convert parts of a .dot-file into graphml code.

First question: Backslash
My .dot-code includes repeatedly the sign "\n".

I would like to search for this sign and substitute it.
This does not provide the effect:

Code:
if(labelstring~/:\\n/) { 
                print "Old: " labelstring;  
                sub("\\\n", " ", labelstring);
                print "New: " labelstring;
            }

I get as a result:
Code:
Old: find?:\n2>assumption>contents_vs_form 
New: find?:\n2>assumption>contents_vs_form

Neither does it work if I write
Code:
sub("\\n", " ", labelstring);

.
(Substituting "assumption" works without problems.)

Do you have any hint of how to get the sign "\n" substituted?

Second question: forcing output not to go onto new lines
I wonder if a simple way exists to tell awk to put a number of outputs onto the same line:
awk reads in from asource file a line word by word. i want to print some words, alter some and then print them, and again simply print some together with some additional information of mine ("info").

Code:
do
        {    
            labelword_cleaned = $labelword;
            sub("\",", " ", labelword_cleaned);
            if(labelword_cleaned~/:\\n/) { 
                print "Old: " labelword_cleaned;  sub("\\\n", " ", labelword_cleaned);
                print "New: " labelword_cleaned;
            }
            print labelword_cleaned 
            if($labelword~/\"/) { 
            # This bit of code brings us out of here if we encounter an '"'.
            break};
            ++labelword;
        } while(labelword<80);

This operation acts on up to 80 words of a line. i want the out put (i.e. cleaned up words) to go on one line, without any linebreaks.

Do you have any hints for me?
cheers,
Ingli
 

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LEARN ABOUT REDHAT

igawk

IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME

       igawk - gawk with include files

SYNOPSIS

       igawk [ all gawk options ] -f program-file [ -- ] file ...
       igawk [ all gawk options ] [ -- ] program-text file ...

DESCRIPTION

       Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).

       AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like

	      @include getopt.awk

       in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.

OPTIONS

       See gawk(1) for a full description of the AWK language and the options that gawk supports.

EXAMPLES

       cat << EOF > test.awk
       @include getopt.awk

       BEGIN {
	    while (getopt(ARGC, ARGV, "am:q") != -1)
		 ...
       }
       EOF

       igawk -f test.awk

SEE ALSO

       gawk(1)

       Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.

AUTHOR

       Arnold Robbins (arnold@skeeve.com).

Free Software Foundation					    Nov 3 1999								  IGAWK(1)
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