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object --+
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subprocess.Popen --+
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Pipe
Specialized pipe class for use by executeCommand.
The executeCommand function needs a specialized way of
interacting with a pipe. First, executeCommand only reads
from the pipe, and never writes to it. Second,
executeCommand needs a way to discard all output written to
stderr, as a means of simulating the shell
2>/dev/null construct.
subprocess.Popen class, so when that class is available,
we'll use it. Otherwise, there's another implementation based on
popen2.Popen4, which unfortunately only works on UNIX
platforms.
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