Csplit

The codice_1 command in Unix and Unix-like operating systems is a utility that is used to split a file into two or more smaller files determined by context lines.
History.
codice_1 is part of the X/Open Portability Guide since issue 2 of 1987. It was inherited into the first version of POSIX and the Single Unix Specification. It first appeared in PWB UNIX.
The version of codice_1 bundled in GNU coreutils was written by Stuart Kemp and David MacKenzie.
Usage.
The command-syntax is:
csplit [OPTION]... FILE PATTERN...
The "patterns" may be line numbers or regular expressions. The program outputs pieces of the file separated by the patterns into files codice_4, codice_5, etc., and outputs the size of each piece, in bytes, to standard output.
The "optional parameters" modify the behaviour of the program in various ways. For example, the default prefix string (xx) and number of digits (2) in the output filenames can be changed.
As with most Unix utilities, a return code of 0 indicates success, while nonzero values indicate failure.
Comparison to split.
The codice_6 command also splits a file into pieces, except that all the pieces are of a fixed size (measured in lines or bytes).