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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 X11R4

paste

PASTE(1)                                                           User Commands                                                          PASTE(1)

NAME

       paste - merge lines of files

SYNOPSIS

       paste [OPTION]... [FILE]...

DESCRIPTION

       Write lines consisting of the sequentially corresponding lines from each FILE, separated by TABs, to standard output.

       With no FILE, or when FILE is -, read standard input.

       Mandatory arguments to long options are mandatory for short options too.

       -d, --delimiters=LIST
              reuse characters from LIST instead of TABs

       -s, --serial
              paste one file at a time instead of in parallel

       -z, --zero-terminated
              line delimiter is NUL, not newline

       --help display this help and exit

       --version
              output version information and exit

AUTHOR

       Written by David M. Ihnat and David MacKenzie.

REPORTING BUGS

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report paste translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2017 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       Full documentation at: <http://www.gnu.org/software/coreutils/paste>
       or available locally via: info '(coreutils) paste invocation'

GNU coreutils 8.28                                                 January 2018                                                           PASTE(1)
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