I find a old C plus plus project wrote all log to a local file, it didn’t truncate the local file but just append strings.
Here is a simple file, I used the string “finished” to split it to different parts.

this is a story about history
haha
finished
the new contents
hello word.
finished
this is the third file
do you know

Find the line numbers of the string in the file.

λ cat -n txt|grep 'finished'|awk '{print $1}'
3
6

As we know sed can output n-m lines on the file.

λ sed -n 1,3p txt
this is a story about history
haha
finished

So lets combine the main logics to make our shell script work.

The script:

λ cat split.sh
numbers=`cat -n txt|grep 'finished'|awk '{print $1}'`
#echo $numbers
firstNumber=1
fileCount=1
fileAllCount=`wc -l txt|awk '{print $1}'`
for secondNumner in $numbers; do
        sed -n ${firstNumber},`expr ${secondNumner} - 1`p txt > $fileCount.txt
        fileCount=`expr $fileCount + 1`
        firstNumber=`expr $secondNumner + 1`
done
sed -n ${firstNumber},${fileAllCount}p txt > $fileCount.txt

The generated files:


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