我正在尝试grep进行tail文件日志并n从一行中获取第th 个单词。示例文件：
$ cat > test.txt <<EOL
Beam goes blah
John goes hey
Beam goes what?
John goes forget it
Beam goes okay
Beam goes bye
EOL
^C
现在，如果我做一个tail：
$ tail -f test.txt
Beam goes blah
John goes hey
Beam goes what?
John goes forget it
Beam goes okay
Beam goes bye
^C
如果我grep认为tail：
$ tail -f test.txt | grep Beam
Beam goes blah
Beam goes what?
Beam …