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(diff.info)Side by Side Format

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Controlling Side by Side Format
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   The `-y' or `--side-by-side' option selects side by side format.
Because side by side output lines contain two input lines, they are
wider than usual.  They are normally 130 columns, which can fit onto a
traditional printer line.  You can set the length of output lines with
the `-W COLUMNS' or `--width=COLUMNS' option.  The output line is split
into two halves of equal length, separated by a small gutter to mark
differences; the right half is aligned to a tab stop so that tabs line
up.  Input lines that are too long to fit in half of an output line are
truncated for output.

   The `--left-column' option prints only the left column of two common
lines.  The `--suppress-common-lines' option suppresses common lines
entirely.