after weeks of frustration of wanting to pass pipes as arguments to my programs, today i realized i can invoke my perl scripts like this by writing less (while having an excellent espresso): 
join.pl "sort -t, A.csv |" "grep LALA B.csv | sort -t, |"

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by removing "<" from open(). this still allows you to pass files too, keeping things "backwards-compatible"

this made me happy.

upon some further reflection, i think that this concept is more useful in OO code, for instance instead of implementing a method such as getFilename( ) you may want to use getFilehandleExpr( ) which is then passed to open($fh, $self->getFilehandleExpr( )). This gives you more flexibility later on when subclassing or implementing setFilehandleExpr( ) since the EXPR passed to open( ) is really a language of itself.

An example of using this technique would be implementing getFileHandleExpr( ) to write out to netcat or gpg or a file.

In reply to passing pipes on the command line by iradik

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