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Full Discussion: Script to compare file sizes
Top Forums Shell Programming and Scripting Script to compare file sizes Post 302515230 by julia_21436 on Tuesday 19th of April 2011 01:56:50 PM
Old 04-19-2011
Question Script to compare file sizes
I need to write a bash script larger X Y that compares the sizes of two specified files X and Y,
and reports which file is larger. For example, if X is larger, the output should be "File X is larger",
while if Y is larger, the output should be "File Y is larger".
If the files are exactly the same size, the output should be "File X and File Y are exactly the same size".
If X and/or Y are not valid names of existing files, then report a reasonable error message, such as "File X does not exist".
If fewer than two command line arguments are specified, an appropriate error message should be given.
Show the output of your script when comparing the size of your shell script called larger to the size of the /etc/passwd file on your Linux system.
Last edited by fpmurphy; 04-19-2011 at 03:21 PM..
 

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LEARN ABOUT CENTOS

gamma4scanimage

gamma4scanimage(1)					   SANE Scanner Access Now Easy 					gamma4scanimage(1)

NAME

       gamma4scanimage - create a gamma table for scanimage

SYNOPSIS

       gamma4scanimage gamma [shadow [highlight [maxin [maxout]]]]

DESCRIPTION

       The tool gamma4scanimage creates a gamma table in the format expected by scanimage. You can define a gamma, a shadow and a highlight value.
       You also can specify the size (maxin) and maximum output value (maxout) of the gamma table.

       gamma is a floating point value, neutral value is 1.0, if the value is larger than 1.0 then the image gets brighter.

       shadow defines the minimum input value that is necessary to create an output value larger than  zero.   shadow  has  to	be  in	the  range
       [0..maxin]. Its default value is 0.

       highlight  defines the maximum input value that produces an output value smaller than maxout.  highlight has to be in the range [0..maxin],
       highlight has to be larger than shadow. Its default value is the same as maxin (16383 if not set).

       maxin defines the size of the gamma table. The size depends on the scanner/backend.  If the scanner uses 8 bits gamma input then maxin  has
       to be set to 255, for 10 bits 1023, for 12 bits 4095, for 14 bits 16383. The default is 16383.  To find out what value maxin has to be call
       scanimage with a very large gamma table [0]0-[99999]255 then scanimage prints an error message with the needed size of the gamma table.

       maxout defines the maximum output value. Take a look at the output of scanimage -h to find out what maxout has to be. The default value	is
       255.

EXAMPLE

       scanimage --custom-gamma=yes --gamma-table `gamma4scanimage 1.8 0 11500 16383 255` >image.pnm

SEE ALSO

       scanimage(1)

AUTHOR

       Oliver Rauch

EMAIL-CONTACT
       Oliver.Rauch@Rauch-Domain.DE

								    10 Jul 2008 						gamma4scanimage(1)
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