Linux in a Nutshell, Fifth Edition

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Chapter 3: Linux Commands

This is the Title of the Book, eMatter Edition

Copyright © 2006 O’Reilly & Associates, Inc. All rights reserved.

uncompress

uncompress [options] files

Uncompress files that were compressed (i.e., whose names end in

.Z). uncompress takes all the same options as compress, except -b

and -r.

unexpand

unexpand [options] [files]

Convert strings of initial whitespace, consisting of at least two

spaces and/or tabs, to tabs. Read from standard input if given no

file or a file named -.

Options

-a, --all

Convert all, not just leading, strings of spaces and tabs.

--first-only

Convert only leading spaces and tabs. Overrides -a.

-t nums, --tabs nums

nums is a comma-separated list of integers that specify the

placement of tab stops. If a single integer is provided, the tab

stops are set to every integer spaces. By default, tab stops are

eight spaces apart. This option implies -a.

--help

Print help message and then exit.

--version

Print the version number and then exit.

unicode_start

unicode_start [font [umap]]

Put keyboard and console in Unicode mode, setting the font to font

and the Unicode map to umap if the font doesn’t have its own map.

If no font is specified, use the default.

unicode_stop

unicode_stop

Take keyboard and console out of Unicode mode.

uniq

uniq [options] [file1 [file2]]

Remove duplicate adjacent lines from sorted file1 or from standard

input, sending one copy of each line to file2 ...