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Top Forums UNIX for Advanced & Expert Users smart question Post 76800 by jerardfjay on Thursday 30th of June 2005 03:46:49 PM

06-30-2005

Registered User

assuming your input file is in_file. You could code something like this

Code:

#! /usr/bin/ksh

size=$(wc -c in_file | awk -F " " '{print $1}')
half_size=`expr $size / 2`
split -b $half_size in_file

The result of the final split command will be two or three files name xaa, xab and xac. you will get two files if the in_file is even number in size else three files with the last file xac being just 1 byte.
If you wanted the first half just read xaa, else read xab and xac if available for the latter.

jerardfjay

Last edited by jerardfjay; 06-30-2005 at 04:48 PM.. Reason: more explanation

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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)