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Top Forums Shell Programming and Scripting Use of awk and printf - help needed Post 302749611 by Don Cragun on Friday 28th of December 2012 05:48:04 PM
Old 12-28-2012
Quote:
Originally Posted by LDHB2012
That's amazing.

It worked the first time around. I really appreciate your help on this.

If you could answer a qusetion... I'm having trouble finding a tutorial or information on the "l - 13" or "l - 9" portion of the code.

I read the man on awk for substr (which is vague and confusing) and I'm just curious how I can make myself fluent in this language without having to pull my hair out and ask a billion questions.... If you could give me some insight on that, I'd really appreciate it.

-David

Happy New Year!

---------- Post updated at 05:27 PM ---------- Previous update was at 05:12 PM ----------

I KIND OF understand what it's saying but not quite.

substr($1, l - 13, 4)

The above looks like it's starting the count, 4 from the end, 13 to the left, which goes over 2012.

substr($1, l - 9, 2)
The above starts the count 2 from the end, 9 to the left, which is right between the 2012 and 12, which seems perfect. Am I missing something here? (obviously I am.)
Hi David,
The awk command l=length($1) sets l to the number of characters in the first field. In your example, this sets l to 35 because there are 35 characters in "20120727-files.files:20120727090044" (not counting the terminating null byte). The substr(x, s, c) returns c characters from the string x starting with the sth character in the string. So, substr($1, l - 13, 4) returns 4 characters from 20120727-files.files:20120727090044 starting with the 22nd character (i.e., "2012"). When a count isn't given (as in substr($1,l - 1)), substr() will return the remainder of the string from the given starting point. This is all done because I assume that the files.files portion of your input lines may vary in length, but we know that the timestamp is always the last 14 characters in the string.
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ENVEXT(1)						  The Canonical Csound Reference						 ENVEXT(1)

NAME
envext - Extracts the envelope of a file to a text file. . SYNTAX
envext [-flags] soundfile csound -U envext [-flags] soundfile INITIALIZATION
soundfile - Name of the input soundfile. The following flags are available for envext (The default values are stated in parenthesis): -o fnam Name of output filename (newenv) -w size (in seconds) of analysis window (0.25) The envext utility generates a text file containing time and amplitude pairs by finding the absolute peak within each window. EXAMPLE
Using the command (while in the manual directory): csound -U envext examples/mary.wav will produce the a text file containing the following: 0.000 0.000 0.000 0.000 0.250 0.000 0.500 0.000 0.750 0.000 1.249 0.170 1.499 0.269 1.530 0.307 1.872 0.263 2.056 0.304 2.294 0.241 2.570 0.216 2.761 0.178 3.077 0.011 3.251 0.001 3.500 0.000 Which shows the time for the peak amplitude within each measured window. CREDITS
Author: John ffitch 1995 AUTHORS
Barry Vercoe MIT Media Lab Author. Dan Ellis MIT Media Lab, Cambridge Massachussetts Author. COPYRIGHT
5.10 08/01/2011 ENVEXT(1)
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