1、使用重定向的方法
[[email protected] ~]# du -h test.txt 4.0K test.txt [[email protected] ~]# > test.txt [[email protected] ~]# du -h test.txt 0 test.txt
2、使用true命令重定向清空文件
[[email protected] ~]# du -h test.txt 4.0K test.txt [[email protected] ~]# true > test.txt [[email protected] ~]# du -h test.txt 0 test.txt
3、使用cat/cp/dd命令及/dev/null设备来清空文件
[[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
4、使用echo命令清空文件
[[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
5、使用truncate命令清空文件
[[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
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