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Full Discussion: removing newlines without changing RS in BEGIN
Top Forums UNIX for Dummies Questions & Answers removing newlines without changing RS in BEGIN Post 302706457 by lucasvs on Wednesday 26th of September 2012 09:34:15 PM
Old 09-26-2012
removing newlines without changing RS in BEGIN
Using awk, is there a way to remove newlines in strings that don't contain 1_ at the beginning, but without setting RS="1_" in the BEGIN section and without using a END section as well?

input:
1_this is line 1
aaaaaaaa
bbbb
1_this is line 2
cccc
1_this is line 3
dddddddddddddd
eeeeeeeeeee
ffffffff

to get this output:
1_this is line 1|aaaaaaaabbbb
1_this is line 2|cccc
1_this is line 3|ddddddddddddddeeeeeeeeeeeffffffff


I think we cannot use RS in a sub function.

Code:
gawk '{

     if ($0 ~ /^"1_"/){
          sub (/$/,"|")
     }
     else{
          sub (/RS/,"")
     }
}1'

---------- Post updated at 08:34 PM ---------- Previous update was at 07:07 PM ----------

It works with that except that a "\n" is missing in the last line:

Code:
gawk 'BEGIN{FS="|"}

{
    if ($0 ~ /^1_/ && NR>1){
        print ""
    }
    printf ("%s", /^1_/ ? $0 FS : $0)
}1'

Last edited by lucasvs; 09-26-2012 at 11:19 PM..
 

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LEARN ABOUT OPENSOLARIS

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).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +--------------------+-----------------+
       |  ATTRIBUTE TYPE    | ATTRIBUTE VALUE |
       +--------------------+-----------------+
       |Availability	    | SUNWgawk	      |
       +--------------------+-----------------+
       |Interface Stability | Volatile	      |
       +--------------------+-----------------+
NOTES

       Source for gawk is available on http://opensolaris.org.

Free Software Foundation					    Nov 3 1999								  IGAWK(1)
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