BSD 2.11 - man page for unexpand (bsd section 1)
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expand, unexpand - expand tabs to spaces, and vice versa
expand [ -tabstop ] [ -tab1,tab2,...,tabn ] [ file ... ]
unexpand [ -a ] [ file ... ]
Expand processes the named files or the standard input writing the standard output with
tabs changed into blanks. Backspace characters are preserved into the output and decre-
ment the column count for tab calculations. Expand is useful for pre-processing character
files (before sorting, looking at specific columns, etc.) that contain tabs.
If a single tabstop argument is given, then tabs are set tabstop spaces apart instead of
the default 8. If multiple tabstops are given then the tabs are set at those specific
Unexpand puts tabs back into the data from the standard input or the named files and
writes the result on the standard output. By default, only leading blanks and tabs are
reconverted to maximal strings of tabs. If the -a option is given, then tabs are inserted
whenever they would compress the resultant file by replacing two or more characters.
4th Berkeley Distribution May 9, 1986 EXPAND(1)
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