Log processing - send each new line in a log file as a parameter to script in real time

Question

I have an active log file (which means there are new lines of log information appended to the file in real time).

What I want: When there is a new line appended, pass the new line of log as a parameter to a script (Bash, C, or even PHP).

What is better: instead of open a new process for every new line of log appended, run a demon process in the background to accept each line of new input.

I tried to Google, but haven't found any useful keyword to start.

By the way, it's running on Debian.

Answer 1

而不是为每个附加的新日志行打开一个新进程，而是在后台运行一个恶魔进程以接受新输入的每一行。

tail -f log | demon&