man/cat1p/csplit.1p.txt
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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) |