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Top Forums Shell Programming and Scripting split file by delimiter with csplit Post 302680257 by drl on Wednesday 1st of August 2012 02:28:59 PM
Old 08-01-2012
Hi.

There is some preliminary coding to display my environment. The core of the solution is:
Code:
bunch input file into super lines -> split into separate files of n (=2 in this demo) -> expand the individual files

The bunching is done with an awk script, gather. Each "bunch" starts with (is separated by), RS=">", the Record Separator. For all the newlines in the bunch, replace the newlines with "=". That creates "super lines".

The split works on lines, so that it does not know that there are really many lines in a super line. For each group of n (=2) super lines, split will write to a new file, xaa, xab, etc.

For all those files xa*, replace "=" with newlines, and re-write the files.

Note that this is a demonstration of a technique. There are certainly other solutions.

Viola! ... cheers, drl
 

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SPLIT(1)						    BSD General Commands Manual 						  SPLIT(1)

NAME
split -- split a file into pieces SYNOPSIS
split [-a suffix_length] [-b byte_count[k|m]] [-l line_count] [-p pattern] [file [name]] DESCRIPTION
The split utility reads the given file and breaks it up into files of 1000 lines each. If file is a single dash ('-') or absent, split reads from the standard input. The options are as follows: -a suffix_length Use suffix_length letters to form the suffix of the file name. -b byte_count[k|m] Create smaller files byte_count bytes in length. If ``k'' is appended to the number, the file is split into byte_count kilobyte pieces. If ``m'' is appended to the number, the file is split into byte_count megabyte pieces. -l line_count Create smaller files n lines in length. -p pattern The file is split whenever an input line matches pattern, which is interpreted as an extended regular expression. The matching line will be the first line of the next output file. This option is incompatible with the -b and -l options. If additional arguments are specified, the first is used as the name of the input file which is to be split. If a second additional argument is specified, it is used as a prefix for the names of the files into which the file is split. In this case, each file into which the file is split is named by the prefix followed by a lexically ordered suffix using suffix_length characters in the range ``a-z''. If -a is not speci- fied, two letters are used as the suffix. If the name argument is not specified, the file is split into lexically ordered files named with the prefix ``x'' and with suffixes as above. ENVIRONMENT
The LANG, LC_ALL, LC_CTYPE and LC_COLLATE environment variables affect the execution of split as described in environ(7). EXIT STATUS
The split utility exits 0 on success, and >0 if an error occurs. SEE ALSO
csplit(1), re_format(7) STANDARDS
The split utility conforms to IEEE Std 1003.1-2001 (``POSIX.1''). HISTORY
A split command appeared in Version 3 AT&T UNIX. BUGS
The maximum line length for matching patterns is 65536. BSD
August 21, 2005 BSD
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