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Top Forums Shell Programming and Scripting script to disc-at-once extract audio books with cdparanoia Post 302560096 by agama on Wednesday 28th of September 2011 11:25:06 PM
Old 09-29-2011
Quote:
Originally Posted by iconoclast hero
So the $1+0 actually adds the initial number on the line? If it was 139ab5, $1+0 would be 139? It just goes through and changes n each time it encounters a number, stops at each . and then when it gets to the end, TOTAL does nothing? So watching n as it went through, it would be "0" for the first 7 lines, then it would proceed through each integer, 1-18, and remain at 18 for the last line?
Correct.

The idea in this case is to set n with each successive leading number. It assumes that the numbers as presented by the source will increase. It is a bit tricky, and a more obvious way of writing it might be along these lines:

Code:
cdparanoia -Q 2>&1| awk '
$1 ~/[0-9]+/ {     # if first token begins with a digit
   if( $1+0 > n )    # if this is the largest we've seen
      n = $1+0;    # capture it
} 
END {print n}'

You'll find with awk there are lots of ways to do the same thing.
 

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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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