#!/bin/bash

SHOWLINES=2

if [ -z "$1" ]; then
    echo ""
    echo "Usage: $0 [file] [number of chunks to split file into]"
    echo ""
    exit 1
else
    SRCFILE=$1
    COUNT=$2
    let "COUNT+=0"
fi

if [ ! -f "${SRCFILE}" ]; then
    echo ""
    echo "- Error: first param should be a file that exists"
    echo ""
    exit 2
fi

if [ -f ${SRCFILE}.aa ]; then
    echo ""
    echo "- Warning: file ${SRCFILE}.aa already exists"
    ls -la ${SRCFILE}.aa
    echo ""
    exit 3
fi

echo "- Original file:"
ls -lah ${SRCFILE}
echo ""
echo "- Splitting, please wait."
time split --verbose -n l/${COUNT} ${SRCFILE} ${SRCFILE}.
echo ""

echo "- Split complete. Results:"
for file in ${SRCFILE}.??; do
    touch -r ${SRCFILE} $file
    ls -lah $file
    echo "- First ${SHOWLINES} of $file:"
    head -n ${SHOWLINES} $file
    echo "- Last ${SHOWLINES} of $file:"
    tail -n ${SHOWLINES} $file
    echo ""
done