Emptying files with shell scripts

Emptying files with shell scripts

In recent projects, a lot of log files are generated, so you need to write a script to empty them manually, here are a few typical ways.

Method 1 Code

#!/bin/bash##方法1echo "" > $1echo "$1 cleaned up."

Run

Description

I think you should notice that the file is not actually emptied, but there is a blank line.

Method 2 Code

#!/bin/bash##方法2: > $1echo "$1 cleaned up."

Run

Description

Where: is an empty command that acts as a placeholder. The emptied file here no longer has a blank line to make the real sense of emptying.

Method 3 Code

#!/bin/bash##方法3cat /dev/null > $1echo "$1 cleaned up."

Run

Description

/dev/null can be seen as a "black hole". All content written to it will be lost. Read from it and read nothing. The emptied file here no longer has a blank line to make the real sense of emptying.

Summarize

Here I only listed three methods, I would like to clear the Linux file method is still a lot of, I personally prefer Method 2.

Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.

Emptying files with shell scripts