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Top Forums Shell Programming and Scripting error while replacing a string by new line character in sed Post 302311142 by panyam on Tuesday 28th of April 2009 03:07:14 AM
Old 04-28-2009
Hi Milan,

In this context of use "deroff -w" , the output is a word list, one ``word'' per line, with all other characters deleted.

I too not that much aware of it's use. From google i found that :

"Deroff reads each file in sequence and removes all nroff and troff(1) requests and non-text arguments, backslash constructions, and constructs of preprocessors such as eqn(1), pic(1), and tbl(1). Remaining text is written on the standard output"

If you are interested u can go through the link to find more about nroff and troff:

Ch 8 -- Basic Formatting with troff/nroff
 

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deroff(1)							   User Commands							 deroff(1)

NAME
deroff - remove nroff/troff, tbl, and eqn constructs SYNOPSIS
deroff [ -m [m | s | l] ] [-w] [-i] [ filename...] DESCRIPTION
deroff reads each of the filenames in sequence and removes all troff(1) requests, macro calls, backslash constructs, eqn(1) constructs (between .EQ and .EN lines, and between delimiters), and tbl(1) descriptions, perhaps replacing them with white space (blanks and blank lines), and writes the remainder of the file on the standard output. deroff follows chains of included files (.so and .nx troff commands); if a file has already been included, a .so naming that file is ignored and a .nx naming that file terminates execution. If no input file is given, deroff reads the standard input. OPTIONS
-m The -m option may be followed by an m, s, or l. The -mm option causes the macros to be interpreted so that only running text is output (that is, no text from macro lines.) The -ml option forces the -mm option and also causes deletion of lists associated with the mm macros. -w If the -w option is given, the output is a word list, one ``word'' per line, with all other characters deleted. Otherwise, the output follows the original, with the deletions mentioned above. In text, a ``word'' is any string that contains at least two let- ters and is composed of letters, digits, ampersands (&), and apostrophes ('); in a macro call, however, a ``word'' is a string that begins with at least two letters and contains a total of at least three letters. Delimiters are any characters other than letters, digits, apostrophes, and ampersands. Trailing apostrophes and ampersands are removed from ``words.'' -i The -i option causes deroff to ignore .so and .nx commands. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWdoc | +-----------------------------+-----------------------------+ SEE ALSO
eqn(1), nroff(1), tbl(1), troff(1), attributes(5) NOTES
deroff is not a complete troff interpreter, so it can be confused by subtle constructs. Most such errors result in too much rather than too little output. The -ml option does not handle nested lists correctly. SunOS 5.10 14 Sep 1992 deroff(1)
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