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Full Discussion: Checking for Alphabets
Top Forums Shell Programming and Scripting Checking for Alphabets Post 302389696 by gregarion on Monday 25th of January 2010 03:22:09 PM
Old 01-25-2010
Sorry, what i meant is . when i entered "." or "" , it seems to give me an error saying ./test: line 8: [[: A time: syntax error in expression (error token is "time").

my test data was

#!/bin/ksh
input="abc time"
digits=$(echo "$input" | tr -dc '[:digit:]')
alpha=$(echo "$input" | tr -dc '[:alpha:]')
[[ ${#alpha} -eq ${#input} ]] && echo 'all alphabetic characters'
[[ ${#digits} -eq ${#input} ]] && echo 'all numeric characters'
[[ ${#alpha} -ne ${#digits} ]] && echo 'not all alpha and not all digits

why does it not read space ?
 

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LEARN ABOUT DEBIAN

ximtoppm

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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