On 3/3/2011 4:07 PM, Greg Aiken wrote:
im wanting to write a simple perl 'filter' program in windows.
I basically took the base code found here...
http://www.techrepublic.com/blog/programming-and-development/simple-filters-in-perl-ruby-and-bourne-shell/3481
the sample here is simple, convert upper case single byte ascii chars
to lower case.
#assume youve got a text file, 'test.txt' = 'THIS is a test file'
#this works on windows:
# filter.pl test.txt
#this doesnt seem to work on windows (should it?):
# type file.txt | filter.pl
while (<>) { #read input from std in
print lc($_); #print to std out the lowercase string
}
C:\perlsrc\getc>filter.pl test.txt
this is a test file
C:\perlsrc\getc>type test.txt
THIS is a test file
C:\perlsrc\getc>type test.txt | filter.pl
The process tried to write to a nonexistent pipe.
when invoked as filter.pl test.txt -- it works fine. but in this case
nothing is technically being 'piped' into filter.pl. instead I am
giving it the name of a file as an ARGV.
when invoked as a true filter, type test.txt | filter.pl, it croaks
with 'the process tried to write to a nonexistent pipe'.
I am not sure if what I am trying to do can be achieved with such
simple code on windows.
Bug in your version of Windows. Workaround: type test.txt | perl
filter.pl
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