Question

I m using tail -f for watching log files in "real time". What to do so be able to view only lines containig 127.0.0.1 for example ?

Answer 1

www.un.org/Depts/DGACM/index_spanish.htm

 tail -f foo | grep  127.0.0.1

Answer 2

tail -f /path/to/log/file | grep --line-buffered 127.0.0.1

The --line-buffered is not strictly needed for grep(1) in this case, but it would be if you wanted to send output to less(1) or some further processing steps, and still wanted to see individual lines as they were logged. (See setvbuf(3) for full details on the buffering.)

Answer 3

Watch is also a cool command for this

watch 鱼

报告将每两秒更新一次。

Answer 4

如果你想要堵塞含有任何IP地址的所有线,而不只是127.0.0.1。

tail -f filename|grep  ^[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}$

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