1.\" Copyright (c) 2002 Tim J. Robbins. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD$ 26.\" 27.Dd December 24, 2008 28.Dt CSPLIT 1 29.Os 30.Sh NAME 31.Nm csplit 32.Nd split files based on context 33.Sh SYNOPSIS 34.Nm 35.Op Fl ks 36.Op Fl f Ar prefix 37.Op Fl n Ar number 38.Ar file args ... 39.Sh DESCRIPTION 40The 41.Nm 42utility splits 43.Ar file 44into pieces using the patterns 45.Ar args . 46If 47.Ar file 48is 49a dash 50.Pq Sq Fl , 51.Nm 52reads from standard input. 53.Pp 54The options are as follows: 55.Bl -tag -width indent 56.It Fl f Ar prefix 57Give created files names beginning with 58.Ar prefix . 59The default is 60.Dq Pa xx . 61.It Fl k 62Do not remove output files. 63.It Fl n Ar number 64Use 65.Ar number 66of decimal digits after the 67.Ar prefix 68to form the file name. 69The default is 2. 70.It Fl s 71Do not write the size of each output file to standard output as it is 72created. 73.El 74.Pp 75The 76.Ar args 77operands may be a combination of the following patterns: 78.Bl -tag -width indent 79.It Xo 80.Sm off 81.Cm / Ar regexp Cm / Op Oo Cm + | - Oc Ar offset 82.Sm on 83.Xc 84Create a file containing the input from the current line to (but not including) 85the next line matching the given basic regular expression. 86An optional 87.Ar offset 88from the line that matched may be specified. 89.It Xo 90.Sm off 91.Cm % Ar regexp Cm % Op Oo Cm + | - Oc Ar offset 92.Sm on 93.Xc 94Same as above but a file is not created for the output. 95.It Ar line_no 96Create containing the input from the current line to (but not including) 97the specified line number. 98.It Cm { Ns Ar num Ns Cm } 99Repeat the previous pattern the specified number of times. 100If it follows a line number pattern, a new file will be created for each 101.Ar line_no 102lines, 103.Ar num 104times. 105The first line of the file is line number 1 for historic reasons. 106.El 107.Pp 108After all the patterns have been processed, the remaining input data 109(if there is any) will be written to a new file. 110.Pp 111Requesting to split at a line before the current line number or past the 112end of the file will result in an error. 113.Sh ENVIRONMENT 114The 115.Ev LANG , LC_ALL , LC_COLLATE 116and 117.Ev LC_CTYPE 118environment variables affect the execution of 119.Nm 120as described in 121.Xr environ 7 . 122.Sh EXIT STATUS 123.Ex -std 124.Sh EXAMPLES 125Split the 126.Xr mdoc 7 127file 128.Pa foo.1 129into one file for each section (up to 20): 130.Pp 131.Dl "csplit -k foo.1 '%^\e.Sh%' '/^\e.Sh/' '{20}'" 132.Pp 133Split standard input after the first 99 lines and every 100 lines thereafter: 134.Pp 135.Dl "csplit -k - 100 '{19}'" 136.Sh SEE ALSO 137.Xr sed 1 , 138.Xr split 1 , 139.Xr re_format 7 140.Sh STANDARDS 141The 142.Nm 143utility conforms to 144.St -p1003.1-2001 . 145.Sh HISTORY 146A 147.Nm 148command appeared in PWB UNIX. 149.Sh BUGS 150Input lines are limited to 151.Dv LINE_MAX 152(2048) bytes in length. 153