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       csplit - split files based on context


       csplit [-ks][-f prefix][-n number] file arg1 ...argn


       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


       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.


       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:


              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
              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 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


              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.

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


       See the INPUT FILES section.


       The input file shall be a text file.


       The following environment variables shall affect the execution of csplit:

       LANG   Provide a default value for the internationalization 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 categories.)

       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.

              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.

              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.


       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>


       The standard error shall be used only for diagnostic messages.


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




       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.




        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}


       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.




       sed , split


       Portions of this text are reprinted and  reproduced  in  electronic  form  from  IEEE  Std
       1003.1,  2003  Edition,  Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003  by
       the  Institute  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 .