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Top Forums UNIX for Dummies Questions & Answers Invalid Characters in the file. Post 302164169 by matrixmadhan on Monday 4th of February 2008 05:19:52 AM
Old 02-04-2008
If the list of characters to be removed is finite have them in the file "unwanted_chars"

and try this code

Code:
#! /opt/third-party/bin/perl

open(FILE, "<", "unwanted_chars");

while(<FILE>) {
  chomp;
  $fileHash{$_} = 0;
}

close(FILE);

open(FILE, "<", $ARGV[0]) || die ("unable to open <$!>\n");

while( read(FILE, $data, 1) == 1 ) {
  $ordVal = ord($data);
  print $data if( !defined($fileHash{$ordVal}) );
}

close(FILE);

exit 0

But if you are sure only ASCII characters need to be in the data file then its much more simpler, range can be specified and no need to use an external lookup file
 

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finite(3M)																finite(3M)

NAME
finite(), finitef(), finitel(), finitew(), finiteq() - finiteness functions SYNOPSIS
DESCRIPTION
The function determines whether its argument has a finite value (zero, subnormal, or normal, and not infinite or NaN). These functions are superseded by the standard macro. They are provided in HP-UX to facilitate importing code from other platform. is a version of it takes a argument. is a version of it takes a argument. is an version of it takes an argument. is equivalent to on HP-UX systems. USAGE
To use these functions, compile either with the default option or with the and options. To use or compile also with the option. Make sure your program includes Link in the math library by specifying on the compiler or linker command line. For more information, see the at the following site: RETURN VALUE
returns a nonzero value if and only if its argument has a finite value. ERRORS
No errors are defined. SEE ALSO
fpclassify(3M) isfinite(3M), isinf(3M), isnan(3M), isnormal(3M), signbit(3M), math(5). STANDARDS CONFORMANCE
These functions are not specified by any current standard. HP Integrity Server Only finite(3M)
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