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Controlling Side by Side Format
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Controlling Side by Side Format
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. See An Example of Side by Side Format and Making Edit Scripts.
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