I would like to know what this command does in a batch script:
subst Q: /D 1>nul 2>nul
What does this "subst" invocation do?
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That looks like a DOS command (not bash).
substsubstitutes a folder for a drive letter or substitutes one drive letter for anotherThe /D deletes (actually unmounts) a virtual (previously substituted) drive. So your command basically removes the virtual drive Q:
The
1>nuland2>nuljust get rid of the output (ie sends the standard output and standard error output to the nul device).