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Top Forums UNIX for Advanced & Expert Users test the string is char or integer Post 302245026 by era on Thursday 9th of October 2008 07:25:13 AM
Old 10-09-2008
You are correct of course; the matching is greedy, and tries its darndest to find a match, so using a negation between wildcards will find a match if there is a way to match it, regardless of the other characters. So the label "pure alpha" is wrong; it should be "alpha + possibly numbers", or the logic should be changed to do additional cases within that case statement.

Code:
case $string in
  *[!0-9A-Za-z]*) echo "Not pure alpha + numbers" ;;
  '') echo "Empty string (duh)" ;;
  *[0-9]*[!0-9]*|*[!0-9]*[0-9]*) echo "Mixed alpha + numbers" ;;
  *[!0-9]*) echo "Pure alpha";;
  *) echo "Pure numbers" ;;
esac

 

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ximtoppm(1)						      General Commands Manual						       ximtoppm(1)

NAME
ximtoppm - convert an Xim file into a portable pixmap SYNOPSIS
ximtoppm [--alphaout={alpha-filename,-}] [ximfile] DESCRIPTION
Reads an Xim file as input. Produces a portable pixmap as output. The Xim toolkit is included in the contrib tree of the X.V11R4 release. OPTIONS
--alphaout=alpha-filename ximtoppm creates a PGM (portable graymap) file containing the alpha channel values in the input image. If the input image doesn't contain an alpha channel, the alpha-filename file contains all zero (transparent) alpha values. If you don't specify --alphaout, ximtoppm does not generate an alpha file, and if the input image has an alpha channel, ximtoppm simply discards it. If you specify - as the filename, ximtoppm writes the alpha output to Standard Output and discards the image. Actually, an Xim image can contain an arbitrary fourth channel -- it need not be an Alpha channel. ximtoppm extracts any fourth channel it finds as described above; it doesn't matter if it is an alpha channel or not. See pnmcomp(1) for one way to use the alpha output file. All options can be abbreviated to their shortest unique prefix. SEE ALSO
pnmcomp(1), ppm(5) AUTHOR
Copyright (C) 1991 by Jef Poskanzer. April 2, 2000 ximtoppm(1)
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