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AWK deifnition and some small code explanation

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Old 05-17-2008
AWK deifnition and some small code explanation
Could someone give me a quick simple explanation for the AWK command.

And also help me to explain the code i have made. I have made some general comments about it myself. I was wondering if people could help me with the rest:

Code:
awk -F'[: ]' 'END {
fmt = "%-20s\t%s\t%s\n"                            # Formats the table output
printf fmt, "Page:", "Hits:", "Unique Hits:"       # Defines Column Headers
for (p in h)
  printf fmt, p, h[p], u[p]
}
!_[$1,$2]++ { u[$1]++ } 		          # u[x] counts the number of occurrences of x in field column 1.
{ h[$1]++ }' HITS |				     # h[x] counts the number of occurrences of x in field column 1.
( IFS='' read header; echo "$header"; sort -k2rn )  # discard any duplicates where same combination of column 1 and 2 has been seen before

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LEARN ABOUT SUSE

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)