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Comparing and Merging Files with GNU diff and patch
by David MacKenzie, Paul Eggert, and Richard Stallman
Paperback (6"x9"), 120 pages
ISBN 0954161750
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10.11.1 Controlling the Verbosity of patch

You can cause patch to produce more messages by using the --verbose option. For example, when you give this option, the message ‘Hmm...’ indicates that patch is reading text in the patch file, attempting to determine whether there is a patch in that text, and if so, what kind of patch it is.

You can inhibit all terminal output from patch, unless an error occurs, by using the -s, --quiet, or --silent option.

ISBN 0954161750Comparing and Merging Files with GNU diff and patchSee the print edition