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User Commands fold(1)
NAME
fold - filter for folding lines
SYNOPSIS
fold [-bs] [-w width | -width] [file...]
DESCRIPTION
The fold utility is a filter that will fold lines from its
input files, breaking the lines to have a maximum of width
column positions (or bytes, if the -b option is specified).
Lines will be broken by the insertion of a NEWLINE character
such that each output line (referred to later in this sec-
tion as a segment) is the maximum width possible that does
not exceed the specified number of column positions (or
bytes). A line will not be broken in the middle of a charac-
ter. The behavior is undefined if width is less than the
number of columns any single character in the input would
occupy.
If the CARRIAGE-RETURN, BACKSPACE, or TAB characters are
encountered in the input, and the -b option is not speci-
fied, they will be treated specially:
BACKSPACE The current count of line width will
be decremented by one, although the
count never will become negative.
fold will not insert a NEWLINE char-
acter immediately before or after
any BACKSPACE character.
CARRIAGE-RETURN The current count of line width will
be set to 0. fold will not insert a
NEWLINE character immediately before
or after any CARRIAGE-RETURN charac-
ter.
TAB Each TAB character encountered will
advance the column position pointer
to the next tab stop. Tab stops will
be at each column position n such
that n modulo 8 equals 1.
OPTIONS
The following options are supported:
SunOS 5.10 Last change: 1 Feb 1995 1
User Commands fold(1)
-b Counts width in bytes rather than column
positions.
-s If a segment of a line contains a blank
character within the first width column
positions (or bytes), breaks the line after
the last such blank character meeting the
width constraints. If there is no blank
character meeting the requirements, the -s
option will have no effect for that output
segment of the input line.
-w width|-width Specifies the maximum line length, in column
positions (or bytes if -b is specified). If
width is not a positive decimal number, an
error is returned. The default value is 80.
OPERANDS
The following operand is supported:
file A path name of a text file to be folded. If no file
operands are specified, the standard input will be
used.
EXAMPLES
Example 1: Submitting a file of possibly long lines to the
line printer
An example invocation that submits a file of possibly long
lines to the line printer (under the assumption that the
user knows the line width of the printer to be assigned by
lp(1)):
example% fold -w 132 bigfile | lp
ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment
variables that affect the execution of fold: LANG, LC_ALL,
LC_CTYPE, LC_MESSAGES, and NLSPATH.
EXIT STATUS
The following exit values are returned:
SunOS 5.10 Last change: 1 Feb 1995 2
User Commands fold(1)
0 All input files were processed successfully.
>0 An error occurred.
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWcsu |
|_____________________________|_____________________________|
| CSI | enabled |
|_____________________________|_____________________________|
| Interface Stability | Standard |
|_____________________________|_____________________________|
SEE ALSO
cut(1), pr(1), attributes(5), environ(5), standards(5)
NOTES
fold and cut(1) can be used to create text files out of
files with arbitrary line lengths. fold should be used when
the contents of long lines need to be kept contiguous. cut
should be used when the number of lines (or records) needs
to remain constant.
fold is frequently used to send text files to line printers
that truncate, rather than fold, lines wider than the
printer is able to print (usually 80 or 132 column posi-
tions).
fold may not work correctly if underlining is present.
SunOS 5.10 Last change: 1 Feb 1995 3
Man(1) output converted with
man2html and wrapped by fishsponge
This page was generated on Wed Sep 12 11:24:42 GMT 2007
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