在Linux中使用时清空文件 [英] Empty a file while in use in linux

问题描述

我正在尝试在使用中清空linux中的文件，它是一个日志文件，因此会被连续写入. 现在我用过:

I'm trying to empty a file in linux while in use, it's a log file so it is continuosly written. Right now I've used:

echo -n > filename

或

cat /dev/null > filename

但是所有这些都会产生一个带有换行符(或我可以在^ @ ^ @ ^ @ ^ @ ^ @ ^ @ ^ @ ^ @ ^ @ ^ @ ^ @ ^ @ ^ @ ^ ..看到的奇怪字符的空文件. vi)，我必须先用vi和dd手动删除第一行，然后保存.

but all of this produce an empty file with a newline character (or strange character that I can see as ^@^@^@^@^@^@^@^@^@^@^@^.. on vi) and I have to remove manually with vi and dd the first line and then save.

如果我不使用vi和dd，则无法使用grep操作文件，但是我需要一个可以在shell脚本中编写的自动过程.

If I don't use vi adn dd I'm not able to manipulate file with grep but I need an automatic procedure that i can write in a shell script.

想法?

推荐答案

这应该足以清空文件:

> file

但是，您说过尝试的其他方法也应该起作用.如果您看到奇怪的字符，则说明它们是通过其他方式写入文件的-最有可能是在那里记录的任何过程.

However, the other methods you said you tried should also work. If you're seeing weird characters, then they are being written to the file by something else - most probably whatever process is logging there.

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