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.

--help

Print help message and then exit.

--version

Print version information and then exit.

fold

fold [option] [files]

Break the lines of the named files so that they are no wider than the

specified width. fold breaks lines exactly at the specified width,

even in the middle of a word. Reads from standard input when

given - as a file. By default, fold cuts at 80 columns; tab counts as

multiple columns, and a backspace as negative one.

Options

-b, --bytes

Count bytes instead of columns, making tab, backspace, and

return characters count as one byte instead of altering the

column count, as in the default behavior.

-c, --characters

Count characters, not columns. Similar to counting by bytes.

-s, --spaces

Break at spaces only, if possible.

-w, --width width, -width

Set the maximum line width to width. The flags -w 6, --width

6, and -6 will all set the maximum width to six columns.

formail

formail [options]

Filter standard input into mailbox format. Useful for splitting mail

digests or passing the contents of a mail file to another program,

such as a spam filter, for additional processing. If no sender is

apparent, provide the sender foo@bar. By default, escape bogus

From lines with >.

Options

+skip

Do not split first skip messages.

-total

Stop after splitting total messages.

-a ...