diffutils: Context Format
2.2.1 Context Format
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The context output format shows several lines of context around the
lines that differ. It is the standard format for distributing updates
to source code.
To select this output format, use the '--context[=LINES]' ('-C
LINES') or '-c' option. The argument LINES that some of these options
take is the number of lines of context to show. If you do not specify
LINES, it defaults to three. For proper operation, 'patch' typically
needs at least two lines of context.
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