PHP或Linux Shell：减少具有10行以上的文本文件的最快方法，只有最后10行

Question

I need to know the fastest way possible, in PHP or Linux Command Shell, to reduce a text file that has more than 10 lines to only have the last 10 lines. I want to use 10 lines for this example.

Thanks :)

Answer 1

to reduce a file to it's last then lines do

tail -n 10 /path/to/file > /path/to/file.tmp && rm /path/to/file && mv /path/to/file.tmp /path/to/file

explanation:

tail outputs the last n lines of a file. > writes it to a file. && is for chaining commands. rm removes a file. mv renames a file (or moves to a different location).