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authorIndrajith K L2022-12-03 17:00:20 +0530
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+csplit(P) csplit(P)
+
+
+
+
+
+NAME
+ csplit - split files based on context
+
+SYNOPSIS
+ csplit [-ks][-f prefix][-n number] file arg1 ...argn
+
+DESCRIPTION
+ The csplit utility shall read the file named by the file
+ operand, write all or part of that file into other files
+ as directed by the arg operands, and write the sizes of
+ the files.
+
+OPTIONS
+ The csplit utility shall conform to the Base Definitions
+ volume of IEEE Std 1003.1-2001, Section 12.2, Utility
+ Syntax Guidelines.
+
+ The following options shall be supported:
+
+ -f prefix
+ Name the created files prefix 00, prefix 01, ...,
+ prefixn. The default is xx00 ... xx n. If the
+ prefix argument would create a filename exceeding
+ {NAME_MAX} bytes, an error shall result, csplit
+ shall exit with a diagnostic message, and no
+ files shall be created.
+
+ -k Leave previously created files intact. By
+ default, csplit shall remove created files if an
+ error occurs.
+
+ -n number
+ Use number decimal digits to form filenames for
+ the file pieces. The default shall be 2.
+
+ -s Suppress the output of file size messages.
+
+
+OPERANDS
+ The following operands shall be supported:
+
+ file The pathname of a text file to be split. If file
+ is '-' , the standard input shall be used.
+
+
+ The operands arg1 ... argn can be a combination of the
+ following:
+
+ /rexp/[offset]
+
+ A file shall be created using the content of the
+ lines from the current line up to, but not
+ including, the line that results from the evalua-
+ tion of the regular expression with offset, if
+ any, applied. The regular expression rexp shall
+ follow the rules for basic regular expressions
+ described in the Base Definitions volume of
+ IEEE Std 1003.1-2001, Section 9.3, Basic Regular
+ Expressions. The application shall use the
+ sequence "\/" to specify a slash character within
+ the rexp. The optional offset shall be a positive
+ or negative integer value representing a number
+ of lines. A positive integer value can be pre-
+ ceded by '+' . If the selection of lines from an
+ offset expression of this type would create a
+ file with zero lines, or one with greater than
+ the number of lines left in the input file, the
+ results are unspecified. After the section is
+ created, the current line shall be set to the
+ line that results from the evaluation of the reg-
+ ular expression with any offset applied. If the
+ current line is the first line in the file and a
+ regular expression operation has not yet been
+ performed, the pattern match of rexp shall be
+ applied from the current line to the end of the
+ file. Otherwise, the pattern match of rexp shall
+ be applied from the line following the current
+ line to the end of the file.
+
+ %rexp%[offset]
+
+ Equivalent to /rexp/[offset], except that no file
+ shall be created for the selected section of the
+ input file. The application shall use the
+ sequence "\%" to specify a percent-sign character
+ within the rexp.
+
+ line_no
+ Create a file from the current line up to (but
+ not including) the line number line_no. Lines in
+ the file shall be numbered starting at one. The
+ current line becomes line_no.
+
+ {num} Repeat operand. This operand can follow any of
+ the operands described previously. If it follows
+ a rexp type operand, that operand shall be
+ applied num more times. If it follows a line_no
+ operand, the file shall be split every line_no
+ lines, num times, from that point.
+
+
+ An error shall be reported if an operand does not refer-
+ ence a line between the current position and the end of
+ the file.
+
+STDIN
+ See the INPUT FILES section.
+
+INPUT FILES
+ The input file shall be a text file.
+
+ENVIRONMENT VARIABLES
+ The following environment variables shall affect the
+ execution of csplit:
+
+ LANG Provide a default value for the internationaliza-
+ tion variables that are unset or null. (See the
+ Base Definitions volume of IEEE Std 1003.1-2001,
+ Section 8.2, Internationalization Variables for
+ the precedence of internationalization variables
+ used to determine the values of locale cate-
+ gories.)
+
+ LC_ALL If set to a non-empty string value, override the
+ values of all the other internationalization
+ variables.
+
+ LC_COLLATE
+
+ Determine the locale for the behavior of ranges,
+ equivalence classes, and multi-character collat-
+ ing elements within regular expressions.
+
+ LC_CTYPE
+ Determine the locale for the interpretation of
+ sequences of bytes of text data as characters
+ (for example, single-byte as opposed to multi-
+ byte characters in arguments and input files) and
+ the behavior of character classes within regular
+ expressions.
+
+ LC_MESSAGES
+ Determine the locale that should be used to
+ affect the format and contents of diagnostic mes-
+ sages written to standard error.
+
+ NLSPATH
+ Determine the location of message catalogs for
+ the processing of LC_MESSAGES .
+
+
+ASYNCHRONOUS EVENTS
+ If the -k option is specified, created files shall be
+ retained. Otherwise, the default action occurs.
+
+STDOUT
+ Unless the -s option is used, the standard output shall
+ consist of one line per file created, with a format as
+ follows:
+
+
+ "%d\n", <file size in bytes>
+
+STDERR
+ The standard error shall be used only for diagnostic
+ messages.
+
+OUTPUT FILES
+ The output files shall contain portions of the original
+ input file; otherwise, unchanged.
+
+EXTENDED DESCRIPTION
+ None.
+
+EXIT STATUS
+ The following exit values shall be returned:
+
+ 0 Successful completion.
+
+ >0 An error occurred.
+
+
+CONSEQUENCES OF ERRORS
+ By default, created files shall be removed if an error
+ occurs. When the -k option is specified, created files
+ shall not be removed if an error occurs.
+
+ The following sections are informative.
+
+APPLICATION USAGE
+ None.
+
+EXAMPLES
+ This example creates four files, cobol00 ... cobol03:
+
+
+ csplit -f cobol file '/procedure division/' /par5./ /par16./
+
+ After editing the split files, they can be recombined as
+ follows:
+
+
+ cat cobol0[0-3] > file
+
+ Note that this example overwrites the original file.
+
+ This example would split the file after the first 99
+ lines, and every 100 lines thereafter, up to 9999 lines;
+ this is because lines in the file are numbered from 1
+ rather than zero, for historical reasons:
+
+
+ csplit -k file 100 {99}
+
+ Assuming that prog.c follows the C-language coding con-
+ vention of ending routines with a '}' at the beginning
+ of the line, this example creates a file containing each
+ separate C routine (up to 21) in prog.c:
+
+
+ csplit -k prog.c '%main(%' '/^}/+1' {20}
+
+RATIONALE
+ The -n option was added to extend the range of filenames
+ that could be handled.
+
+ Consideration was given to adding a -a flag to use the
+ alphabetic filename generation used by the historical
+ split utility, but the functionality added by the -n
+ option was deemed to make alphabetic naming unnecessary.
+
+FUTURE DIRECTIONS
+ None.
+
+SEE ALSO
+ sed , split
+
+COPYRIGHT
+ Portions of this text are reprinted and reproduced in
+ electronic form from IEEE Std 1003.1, 2003 Edition,
+ Standard for Information Technology -- Portable Operat-
+ ing System Interface (POSIX), The Open Group Base Speci-
+ fications Issue 6, Copyright (C) 2001-2003 by the Insti-
+ tute of Electrical and Electronics Engineers, Inc and
+ The Open Group. In the event of any discrepancy between
+ this version and the original IEEE and The Open Group
+ Standard, the original IEEE and The Open Group Standard
+ is the referee document. The original Standard can be
+ obtained online at http://www.open-
+ group.org/unix/online.html .
+
+
+
+POSIX 2003 csplit(P)