CSPLIT(1P)                POSIX Programmer's Manual               CSPLIT(1P)

PROLOG         top

       This manual page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the
       corresponding Linux manual page for details of Linux behavior), or
       the interface may not be implemented on Linux.

NAME         top

       csplit — split files based on context

SYNOPSIS         top

       csplit [−ks] [−f prefix] [−n number] file arg...

DESCRIPTION         top

       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         top

       The csplit utility shall conform to the Base Definitions volume of
       POSIX.1‐2008, Section 12.2, Utility Syntax Guidelines.

       The following options shall be supported:

       −f prefix Name the created files prefix00, prefix01, ..., prefixn.
                 The default is xx00 ...  xxn.  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         top

       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.

       Each arg operand can be one of the following:

                 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 evaluation 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 POSIX.1‐2008, 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 preceded 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 regular 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.

                 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

       {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 reference a line
       between the current position and the end of the file.

STDIN         top

       See the INPUT FILES section.

INPUT FILES         top

       The input file shall be a text file.


       The following environment variables shall affect the execution of

       LANG      Provide a default value for the internationalization
                 variables that are unset or null. (See the Base Definitions
                 volume of POSIX.1‐2008, Section 8.2, Internationalization
                 Variables for the precedence of internationalization
                 variables used to determine the values of locale

       LC_ALL    If set to a non-empty string value, override the values of
                 all the other internationalization variables.

                 Determine the locale for the behavior of ranges,
                 equivalence classes, and multi-character collating 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

                 Determine the locale that should be used to affect the
                 format and contents of diagnostic messages written to
                 standard error.

       NLSPATH   Determine the location of message catalogs for the
                 processing of LC_MESSAGES.


       If the −k option is specified, created files shall be retained.
       Otherwise, the default action occurs.

STDOUT         top

       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         top

       The standard error shall be used only for diagnostic messages.

OUTPUT FILES         top

       The output files shall contain portions of the original input file;
       otherwise, unchanged.



EXIT STATUS         top

       The following exit values shall be returned:

        0    Successful completion.

       >0    An error occurred.


       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.



EXAMPLES         top

        1. 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.

        2. 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}

        3. Assuming that prog.c follows the C-language coding convention 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         top

       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.



SEE ALSO         top

       sed(1p), split(1p)

       The Base Definitions volume of POSIX.1‐2008, Chapter 8, Environment
       Variables, Section 9.3, Basic Regular Expressions, Section 12.2,
       Utility Syntax Guidelines

COPYRIGHT         top

       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The Open
       Group Base Specifications Issue 7, Copyright (C) 2013 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
       applied.) 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 .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the
       source files to man page format. To report such errors, see .

IEEE/The Open Group                 2013                          CSPLIT(1P)

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