* Fix trailing whitespace in blead 778c687

[perl5.git] / pod / perlfilter.pod

diff --git a/pod/perlfilter.pod b/pod/perlfilter.pod
index d43028c..ca5cfd9 100644 (file)
--- a/pod/perlfilter.pod
+++ b/pod/perlfilter.pod
@@ -81,9 +81,8 @@ a source filter is just a special kind of module. Like all Perl
 modules, a source filter is invoked with a use statement.
 
 Say you want to pass your Perl source through the C preprocessor before
-execution. You could use the existing C<-P> command line option to do
-this, but as it happens, the source filters distribution comes with a C
-preprocessor filter module called Filter::cpp. Let's use that instead.
+execution. As it happens, the source filters distribution comes with a C
+preprocessor filter module called Filter::cpp.
 
 Below is an example program, C<cpp_test>, which makes use of this filter.
 Line numbers have been added to allow specific lines to be referenced
@@ -205,7 +204,7 @@ source filter (see Decryption Filters, below).
 
 All decryption filters work on the principle of "security through
 obscurity." Regardless of how well you write a decryption filter and
-how strong your encryption algorithm, anyone determined enough can
+how strong your encryption algorithm is, anyone determined enough can
 retrieve the original source code. The reason is quite simple - once
 the decryption filter has decrypted the source back to its original
 form, fragments of it will be stored in the computer's memory as Perl
@@ -227,7 +226,7 @@ module.
 An alternative to writing the filter in C is to create a separate
 executable in the language of your choice. The separate executable
 reads from standard input, does whatever processing is necessary, and
-writes the filtered data to standard output. C<Filter:cpp> is an
+writes the filtered data to standard output. C<Filter::cpp> is an
 example of a source filter implemented as a separate executable - the
 executable is the C preprocessor bundled with your C compiler.