For most POSIX-wannabe platforms, STDIN is handle 0, STDOUT is handle 1, STDERR is handle 2.

• "command >foo" is the same as "command 1>foo".
• "command 2>foo" redirects errors, not output.
• "command 2>&1" ties error output to wherever plain output is going.

Some command shells have different syntax for these, and some are picky about the order ("command foo 2>&1 1>foo" may act differently).

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