What does the following code snippet do? IF EXISTS c:\test.txt del c:\test.txt Dir %WinDir%\ >> c:\test.txt
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Deletes c:\test.txt and lists the contents of c:\Windows to c:\test.txt
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Errors out as test.txt does not exist
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Deletes c:\test.txt, if exists, and lists the contents of c:\window to c:\test.txt
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Errors out as test.txt does not exist and rolls back all the commands.
The first line conditionally deletes c:\test.txt only if it exists. The second line appends the directory listing of the Windows folder (referenced by %WinDir%) to c:\test.txt. This effectively creates a new file or clears an existing one, then populates it with the directory contents.
The batch script first checks whether c:\test.txt exists and deletes it if so, avoiding an error from appending to a stale file. It then runs Dir %WinDir%\ to list the contents of the Windows directory and redirects (>>, append mode) that output into c:\test.txt. Since the file was just deleted (or never existed), the redirect effectively creates a fresh file containing the directory listing, matching the described behavior.