For loop in CMD parsing entries in a TXT file

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for %a in (host1 host2 host3) do Ping %a

The same, but reading from file instead:

for /F %a in (hosts.txt) do Ping %a

If your file contains spaces, then this amend would be required:

for /F "tokens=* delims=," %a in (hosts.txt) do Ping %a