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Full Discussion: Split large file into 24 small files on one hour basis
Top Forums UNIX for Beginners Questions & Answers Split large file into 24 small files on one hour basis Post 303036522 by RudiC on Monday 1st of July 2019 04:00:38 AM
Old 07-01-2019
Try also
Code:
paste <(date +%s -f<(cut -d, -f1 file) 2>&1) file | awk -F"\t" '
NR == 1         {sub ($1 FS, "")
                 HD = $0
                }
NR == 2         {BDT = $1 - $1%60
                }
NR >  1         {HCNT = int (($1 - BDT)/3600)
                 if (HCNT > 23) exit
                 FN = "summaryReport_LoadTest_" HCNT ".csv"
                 sub ($1 FS, "")
                 if (!X[FN]++) print HD  >  FN
                 print  >  FN
                }
'

It calculates the start from the first timestamp encountered in line 2. If you want to pass the start from outside, set BDT with awk's -v option. Then, to skip the leading lines outside the target window, additional logics need to be installed.
 

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LEARN ABOUT NETBSD

split

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 -n chunk_count] [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.  file itself is not altered.

     The options are as follows:

     -a      Use suffix_length letters to form the suffix of the file name.

     -b      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      Create smaller files line_count lines in length.

     -n      Split file into chunk_count smaller files.

     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, 'x' is used.

STANDARDS

     The split utility conforms to IEEE Std 1003.1-2001 (``POSIX.1'').

HISTORY

     A split command appeared in Version 6 AT&T UNIX.

     The -a option was introduced in NetBSD 2.0.  Before that, if name was not specified, split would vary the first letter of the filename to
     increase the number of possible output files.  The -a option makes this unnecessary.

BSD
								   May 28, 2007 							       BSD
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