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Top Forums UNIX for Beginners Questions & Answers Split a txt file on the basis of line number Post 303033564 by RavinderSingh13 on Monday 8th of April 2019 11:44:30 AM
Old 04-08-2019
Hello abhaydas,

I believe your number of lines which you need in output split files are NOT even. So I am coming up here with an approach where one could mention the line numbers when they want to generate a new output file. Let's say your own example posted one, you need first 20 lines in file1, then next 10 lines to file2, next 10 lines to file3, next 10 lines to file4 and then next 40 lines to file5. If this is the case then could you please try following(I have NOT tested it, I am cooking right now, I am pretty sure it should WORK Smilie ).

Code:
awk '
BEGIN{
  split("20,10,10,10,40",array,",")
  count=1
  file="file"count
}
FNR==array[count]{
  print $0 > file
  close(file)
  file="file"++count
  next
}
{
  print $0 > file
}'  Input_file

NOTE: Point to be noted here is split("20,10,10,10,40",array,",") code's part is responsible for mentioning number of lines in output file so please be sure you are providing proper values here.

NOTE2: Also I am closing the output files with close(file) statement to avoid errors like
Quote:
Too many files opened etc..
Thanks,
R. Singh
 

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

NAME
split -- split a file into pieces SYNOPSIS
split -d [-l line_count] [-a suffix_length] [file [prefix]] split -d -b byte_count[K|k|M|m|G|g] [-a suffix_length] [file [prefix]] split -d -n chunk_count [-a suffix_length] [file [prefix]] split -d -p pattern [-a suffix_length] [file [prefix]] DESCRIPTION
The split utility reads the given file and breaks it up into files of 1000 lines each (if no options are specified), leaving the file unchanged. 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|k|M|m|G|g] Create split files byte_count bytes in length. If k or K is appended to the number, the file is split into byte_count kilobyte pieces. If m or M is appended to the number, the file is split into byte_count megabyte pieces. If g or G is appended to the num- ber, the file is split into byte_count gigabyte pieces. -d Use a numeric suffix instead of a alphabetic suffix. -l line_count Create split files line_count lines in length. -n chunk_count Split file into chunk_count smaller files. -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 prefix 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
May 9, 2013 BSD
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