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 February 6, 2014 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 54Files are created with a prefix of 55.Dq xx 56and two decimal digits. 57The size of each file is written to standard output 58as it is created. 59If an error occurs whilst files are being created, 60or a 61.Dv HUP , 62.Dv INT , 63or 64.Dv TERM 65signal is received, 66all files previously written are removed. 67.Pp 68The options are as follows: 69.Bl -tag -width indent 70.It Fl f Ar prefix 71Create file names beginning with 72.Ar prefix , 73instead of 74.Dq Pa xx . 75.It Fl k 76Do not remove previously created files if an error occurs or a 77.Dv HUP , 78.Dv INT , 79or 80.Dv TERM 81signal is received. 82.It Fl n Ar number 83Create file names beginning with 84.Ar number 85of decimal digits after the prefix, 86instead of 2. 87.It Fl s 88Do not write the size of each output file to standard output as it is 89created. 90.El 91.Pp 92The 93.Ar args 94operands may be a combination of the following patterns: 95.Bl -tag -width indent 96.It Xo 97.Sm off 98.Cm / Ar regexp Cm / Op Oo Cm + | - Oc Ar offset 99.Sm on 100.Xc 101Create a file containing the input from the current line to (but not including) 102the next line matching the given basic regular expression. 103An optional 104.Ar offset 105from the line that matched may be specified. 106.It Xo 107.Sm off 108.Cm % Ar regexp Cm % Op Oo Cm + | - Oc Ar offset 109.Sm on 110.Xc 111Same as above but a file is not created for the output. 112.It Ar line_no 113Create containing the input from the current line to (but not including) 114the specified line number. 115.It Cm { Ns Ar num Ns Cm } 116Repeat the previous pattern the specified number of times. 117If it follows a line number pattern, a new file will be created for each 118.Ar line_no 119lines, 120.Ar num 121times. 122The first line of the file is line number 1 for historic reasons. 123.El 124.Pp 125After all the patterns have been processed, the remaining input data 126(if there is any) will be written to a new file. 127.Pp 128Requesting to split at a line before the current line number or past the 129end of the file will result in an error. 130.Sh ENVIRONMENT 131The 132.Ev LANG , LC_ALL , LC_COLLATE 133and 134.Ev LC_CTYPE 135environment variables affect the execution of 136.Nm 137as described in 138.Xr environ 7 . 139.Sh EXIT STATUS 140.Ex -std 141.Sh EXAMPLES 142Split the 143.Xr mdoc 7 144file 145.Pa foo.1 146into one file for each section (up to 21 plus one for the rest, if any): 147.Pp 148.Dl "csplit -k foo.1 '%^\e.Sh%' '/^\e.Sh/' '{20}'" 149.Pp 150Split standard input after the first 99 lines and every 100 lines thereafter: 151.Pp 152.Dl "csplit -k - 100 '{19}'" 153.Sh SEE ALSO 154.Xr sed 1 , 155.Xr split 1 , 156.Xr re_format 7 157.Sh STANDARDS 158The 159.Nm 160utility conforms to 161.St -p1003.1-2001 . 162.Sh HISTORY 163A 164.Nm 165command appeared in PWB UNIX. 166.Sh BUGS 167Input lines are limited to 168.Dv LINE_MAX 169(2048) bytes in length. 170