将Linux文件清空的几种方法详解程序员

[[email protected] ~]# du -h test.txt 

4.0K test.txt 

[[email protected] ~]# test.txt 

[[email protected] ~]# du -h test.txt 

0 test.txt

[[email protected] ~]# du -h test.txt 

4.0K test.txt 

[[email protected] ~]# true test.txt 

[[email protected] ~]# du -h test.txt 

0 test.txt

[[email protected] ~]# du -h test.txt 

4.0K test.txt 

[[email protected] ~]# cat /dev/null test.txt 

[[email protected] ~]# du -h test.txt 

0 test.txt
################################################### 

[[email protected] ~]# echo "Hello World" test.txt 

[[email protected] ~]# du -h test.txt 

4.0K test.txt 

[[email protected] ~]# cp /dev/null test.txt 

cp：是否覆盖"test.txt"？ y 

[[email protected] ~]# du -h test.txt 

0 test.txt
################################################## 

[[email protected] ~]# echo "Hello World" test.txt 

[[email protected] ~]# du -h test.txt 

4.0K test.txt 

[[email protected] ~]# dd if=/dev/null of=test.txt 

记录了0+0 的读入 

记录了0+0 的写出 

0字节(0 B)已复制，0.000266781 秒，0.0 kB/秒 

[[email protected] ~]# du -h test.txt 

0 test.txt

[[email protected] ~]# echo "Hello World" test.txt 

[[email protected] ~]# du -h test.txt 

4.0K test.txt 

[[email protected] ~]# echo -n "" test.txt == 要加上"-n"参数，默认情况下会"/n"，也就是回车符 

[[email protected] ~]# du -h test.txt 

0 test.txt

[[email protected] ~]# du -h test.txt 

4.0K test.txt 

[[email protected] ~]# truncate -s 0 test.txt -s参数用来设定文件的大小，清空文件，就设定为0； 

[[email protected] ~]# du -h test.txt 

0 test.txt

原创文章，作者：ItWorker，如若转载，请注明出处：https://blog.ytso.com/3030.html