Shell Programming and Scripting

How do I split a file into many parts but with different amounts of lines per part? I looked at the split command but that only splits evenly.

I'd like a range specified to determine how many lines each output file should have.

For example, if the input file has 1000 lines and the range is 200 - 300, one possible output would be that the files have 247, 212, 275, and 266 lines each.

It doesn't have to come out exactly like the above example. A "leftover" file is alright. If the following were chosen for each amount then there will be leftover lines:
295 (file1) + 297 (file2) + 300 (file3) + 108 leftover (file4)

with some mathematics, you can do something like:

Code:

echo "Enter 3 random numbers in which you want to split the file."
read num1 num2 num3

filename="file.main"

total=$(wc -l $filename | awk '{print $1}')

start_1=1
end_1=$num1

start_2=$(echo "${end_1}+1" | bc)
end_2=$(echo "${start_2}+$num2" | bc)

start_3=$(echo "${end_2}+1" | bc)
end_3=$(echo "${start_3}+${num3}" | bc)

start_4=$(echo "${end_3}+1" | bc)
end_4=$total


sed -n "${start_1},${end_1}p" $filename > file1
sed -n "${start_2},${end_2}p" $filename > file2
sed -n "${start_3},${end_3}p" $filename > file3
sed -n "${start_4},${end_4}p" $filename > file4