(diff.info) White Space

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 Suppressing Differences in Blank and Tab Spacing
 ================================================
 
    The `-E' and `--ignore-tab-expansion' options ignore the distinction
 between tabs and spaces on input.  A tab is considered to be equivalent
 to the number of spaces to the next tab stop.  `diff' assumes that tab
 stops are set every 8 print columns.
 
    The `-b' and `--ignore-space-change' options are stronger.  They
 ignore white space at line end, and consider all other sequences of one
 or more white space characters to be equivalent.  With these options,
 `diff' considers the following two lines to be equivalent, where `$'
 denotes the line end:
 
      Here lyeth  muche rychnesse  in lytell space.   -- John Heywood$
      Here lyeth muche rychnesse in lytell space. -- John Heywood   $
 
    The `-w' and `--ignore-all-space' options are stronger still.  They
 ignore difference even if one line has white space where the other line
 has none.  "White space" characters include tab, newline, vertical tab,
 form feed, carriage return, and space; some locales may define
 additional characters to be white space.  With these options, `diff'
 considers the following two lines to be equivalent, where `$' denotes
 the line end and `^M' denotes a carriage return:
 
      Here lyeth  muche  rychnesse in lytell space.--  John Heywood$
        He relyeth much erychnes  seinly tells pace.  --John Heywood   ^M$
 

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