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unexpand: Convert spaces to tabs
unexpand writes the contents of each given file, or
standard input if none are given or for a file of `-', to
standard output, with strings of two or more space or tab characters
converted to as many tabs as possible followed by as many spaces as are
unexpand [option]... [file]...
unexpand converts only initial spaces and tabs (those
that precede all non space or tab characters) on each line. It
preserves backspace characters in the output; they decrement the column
count for tab calculations. By default, tabs are set at every 8th
The program accepts the following options. Also see 2. Common options.
On older systems,
unexpand supports an obsolete option
`-tab1[,tab2]...', where tabstops must be
separated by commas. (Unlike `-t', this obsolete option does
not imply `-a'.) POSIX 1003.1-2001 (see section 2.5 Standards conformance) does not allow this; use `--first-only -t
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