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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 303036476 by MadeInGermany on Friday 28th of June 2019 05:32:33 AM
Old 06-28-2019
Here is a shell script that simply splits on the hour (00...23):
Code:
#!/bin/sh
split_to(){
  prev=""
  read header
  while IFS=" :" read date hour rest
  do
    case $hour in
    ([0-9][0-9])
      if [ "$hour" != "$prev" ]
      then
        exec >"$hour.$1"
        prev=$hour
        echo "$header"
      fi
      echo "${date} ${hour}:${rest}"
    ;;
    esac
  done
}

if [ $# -eq 0 ]
then
  split_to out
fi
for arg
do
  split_to "$arg" < "$arg"
done

Run with /path/to/scriptname filename to get 00.filename ... 23.filename
or with /path/to/scriptname < filename to get 00.out ... 23.out
 

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LEARN ABOUT PLAN9

split

SPLIT(1)						      General Commands Manual							  SPLIT(1)

NAME

       split - split a file into pieces

SYNOPSIS

       split [ option ...  ] [ file ]

DESCRIPTION

       Split reads file (standard input by default) and writes it in pieces of 1000 lines per output file.  The names of the output files are xaa,
       xab, and so on to xzz.  The options are

       -n     Split into n-line pieces.

       -e expression
	      File divisions occur at each line that matches a regular expression; see regexp(6).  Multiple -e options may appear.   If  a  subex-
	      pression	of  expression is contained in parentheses (...), the output file name is the portion of the line which matches the subex-
	      pression.

       -f stem
	      Use stem instead of x in output file names.

       -s suffix
	      Append suffix to names identified under -e.

       -x     Exclude the matched input line from the output file.

       -i     Ignore case in option -e; force output file names (excluding the suffix) to lower case.

SOURCE

       /sys/src/cmd/split.c

SEE ALSO

       sed(1), awk(1) grep(1), regexp(6)

																	  SPLIT(1)
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