Sorting and wc -l w.r.t seconds Post: 302769319

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Top Forums UNIX for Dummies Questions & Answers Sorting and wc -l w.r.t seconds Post 302769319 by Don Cragun on Tuesday 12th of February 2013 01:43:07 AM

02-12-2013

Registered User

Quote:

Originally Posted by mirwasim

Thank you , I will check it out, but can you tell me what it does ?

Sorry. I thought it was pretty obvious. But, I see that I left in a debugging statement that probably confused things.

The corrected script is:

Code:

awk '{  c[$1]++}
END {   for(h = 0; h <= 23; h++)
                for(m = 0; m <= 59; m++)
                        for(s = 0; s <= 59; s++) 
                                if((k = sprintf("%02d:%02d:%02d",h,m,s)) in c)
                                        printf("%s %4d\n", k, c[k])
}' file

The first line sets up an array (c) that counts each occurrence of the timestamps in the first field of the file. (Normally, I would have used $0 here instead of $1, but your 1st line has trailing whitespace characters on the line.)

The rest of the lines execute once after the last line has been read from the input file. It creates a key (k) that is the hour, minute, and second for every second in a day (ignoring leap seconds) and if there was an entry in c for that time, it prints the time and the number of lines that had that time as the 1st field in the input file.

Don Cragun

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LEARN ABOUT REDHAT

ppmtosixel

ppmtosixel(1)						      General Commands Manual						     ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.	The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
	      pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order	of  magni-
	      tude larger than a compressed file and prints much slower.

       -margin
	      If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
	      fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater	than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

								   26 April 1991						     ppmtosixel(1)