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Full Discussion: awk decrement loop
Top Forums Shell Programming and Scripting awk decrement loop Post 302735567 by Don Cragun on Sunday 25th of November 2012 03:46:13 PM
Old 11-25-2012
Note that according to the standards, setting FS to an empty string produces undefined results. (Doing so treats each character as a field in gawk and some other version of awk, but generates various errors or unexpected results on other versions of awk.) If I understand what shivacoder is trying to do, I think the following is a portable way to do what was requested:
Code:
awk -v c=4 '{
        for(i = c; i >= 1; i--) {
                # Print a header preceded by a <newline> if this is not the 1st
                # output line.
                printf("%sProcessing %d character strings from \"%s\".\n",
                        i != c || NR > 1 ? "\n" : "", i, $0)
                if(i > length($0)) {
                        printf("There aren'\''t %d characters in \"%s\".\n",
                                i, $0) 
                        continue
                }
                # Print the 1st line.
                printf("%s%s%s\n", substr($0, 1, i),
                        i == length($0) ? "" : "_", substr($0, i + 1))
                if(length($0) >= i)
                        for(j = 1; j + i < length($0); j++)
                                printf("%s_%s_%s\n", substr($0, 1, j),
                                        substr($0, j + 1, i),
                                        substr($0, j + i + 1))
                # Do not print the last line if it would duplicate the 1st line.
                if(i != length($0) / 2 && length($0) > i)
                        printf("%s_%s\n", substr($0, 1, length($0) - i),
                                substr($0, length($0) - i + 1))
        }
}' input

Last edited by Don Cragun; 11-26-2012 at 01:18 AM..
 

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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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