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.

Options

-c num

Format output into num columns.

-s char

Delimit table columns with char. Meaningful only with -t.

-t Format input into a table. Delimit with whitespace, unless an

alternate delimiter has been provided with -s.

-x Fill columns before filling rows.

comm

comm [options] file1 file2

Compare lines common to the sorted files file1 and file2. Output is

in three columns, from left to right: lines unique to file1, lines

unique to file2, and lines common to both files. comm is similar to

diff in that both commands compare two files. But comm can also

be used like uniq; comm selects duplicate or unique lines between

two sorted files, whereas uniq selects duplicate or unique lines

within the same sorted file.

Options

- Read the standard input.

-num

Suppress printing of column num. Multiple columns may be

specified and should not be space-separated.

--help

Print help message and exit.

--version

Print version information and exit.

Example

Compare two lists of top-10 movies, and display items that appear

in both lists:

comm -12 siskel_top10 ebert_top10

compress

compress [options] files

Compress one or more files, replacing each with the compressed

file of the same name with .Z appended. If no file is specified,

compress standard input. Each file specified is compressed sepa- ...