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Full Discussion: awk search for max and min while ignoring special character
Top Forums Shell Programming and Scripting awk search for max and min while ignoring special character Post 302950865 by Don Cragun on Wednesday 29th of July 2015 01:41:18 PM
Old 07-29-2015
For two fields and assuming that line 1 in a file could also be your special character, you could try:
Code:
awk '
NF > 1 {if(!nf++) {
		m1 = M1 = $1
		m2 = M2 = $2
	} else {if($1 + 0 < m1)	m1 = $1
		if($1 + 0 > M1)	M1 = $1
		if($2 + 0 < m2)	m2 = $2
		if($2 + 0 > M2)	M2 = $2
	}
}
END {	print "MinColumn1 MaxColumn1 MinColumn2 MaxColumn2"
	printf("%10s %10s %10s %10s\n", m1, M1, m2, M2)
}' file

which, with your sample input produces the output:
Code:
MinColumn1 MaxColumn1 MinColumn2 MaxColumn2
 -123.7820  -119.9950    39.5520    42.0009

If you want to try this on a Solaris/SunOS system, change awk to /usr/xpg4/bin/awk.

PS. Just to be clear, the above code produces the same output if the input file is:
Code:
>
-122.2840   42.0009
-119.9950   41.1777
>
-123.7540   39.5520
-123.7820   39.6872

instead of the provided sample, while the other suggestions in this thread don't seem to produce the desired output in this case. It isn't clear to me from the provided description of the input file format whether or not this matters for the submitter's real world data.
Last edited by Don Cragun; 07-29-2015 at 03:04 PM.. Reason: Add PS.
 

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LEARN ABOUT DEBIAN

truchet

truchet(6x)							XScreenSaver manual						       truchet(6x)

NAME

       truchet - draws curved or angular Truchet patterns

SYNOPSIS

       truchet	[-display  host:display.screen]   [-foreground	color]	[-background  color] [-window] [-root] [-mono] [-install] [-visual visual]
       [-delay milliseconds] [-min-width integer] [-min-height integer] [-max-width integer] [-max-height integer] [-max-linewidth integer] [-min-
       linewidth  integer]  [-erase]  [-no-erase]  [-erase-count  integer]  [-square]  [-not-square]  [-curves] [-no-curves] [-angle] [-no-angles]
       [-scroll] [-scroll-overlap integer] [-anim-delay integer] [-anim-step-size integer]

       [-fps]

DESCRIPTION

       The truchet program draws arc and line based Truchet patterns.

OPTIONS

       truchet accepts the following options:

       -window Draw on a newly-created window.	This is the default.

       -root   Draw on the root window.

       -mono   If on a color display, pretend we're on a monochrome display.

       -install
	       Install a private colormap for the window.

       -visual visual
	       Specify which visual to use.  Legal values are the name of a visual class, or the id number (decimal or hex) of a specific visual.

       -delay milliseconds
	       How long to wait between drawing each screenful. Default is 1 seconds.

       -min-width integer
	       The minimum width in pixels of each square. Default is 40.

       -min-height integer
	       The minimum height in pixels of each square. Default is 40.

       -max-width integer
	       The maximum width in pixels of each square. Default is 150.

       -max-height integer
	       The maximum height in pixels of each square. Default is 150.

       -max-linewidth integer
	       The maximum width of the lines used to draw. Default is 25.

       -min-linewidth integer
	       The minimum width of the lines used to draw. Default is 2.

       -erase

       -no-erase
	       Whether to clear the screen after each screenful is drawn. Default is True (erase).

       -erase-count integer
	       The number of screenfuls to draw before erasing. Default is 25.

       -square

       -not-square
	       Whether to force the tiles to be square. Default is True (square).

       -curves

       -no-curves
	       Whether to draw the arc based Truchet pattern. Default is True (curves).

       -angles

       -no-angles
	       Whether or not to draw the line based Truchet pattern. Default is True (angles)

       -scroll Use the scroll mode. Default is False.

       -scroll-overlap
	       The amount to scroll from one side to another. Default is 400.

       -anim-delay
	       The time to pause between each animation step. Default is 100.

       -anim-step-size
	       The amount of steps to skip between each animation step. Default is 3.

       -fps    Display the current frame rate and CPU load.

ENVIRONMENT

       DISPLAY to get the default host and display number.

       XENVIRONMENT
	       to get the name of a resource file that overrides the global resources stored in the RESOURCE_MANAGER property.

SEE ALSO

       X(1), xscreensaver(1)

COPYRIGHT

       Copyright (C) 1998 by Adrian Likins.

       Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, pro-
       vided  that  the  above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in sup-
       porting documentation.

AUTHOR

       Adrian Likins, 1998.

X Version 11							5.15 (28-Sep-2011)						       truchet(6x)
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