touch命令详解

一、用法

touch命令主要有两个功能：

• 将已存在文件的时间更改为当前系统时间
• 创建一个空的文件

常见参数详解：

-a  change only the access time

-c, --no-create
       do not create any files

-d, --date=STRING
       parse STRING and use it instead of current time

-f     (ignored)

-h, --no-dereference
       affect  each symbolic link instead of any referenced file (useful only
       on systems that can change the timestamps of a symlink)

-m     change only the modification time

-r, --reference=FILE
       use this file's times instead of current time

-t STAMP
      use [[CC]YY]MMDDhhmm[.ss] instead of current time

--time=WORD
      change the specified time: WORD is access, atime, or  use:  equivalent
      to -a WORD is modify or mtime: equivalent to -m

二、实战

#创建一个不存在的空文件，如果存在无影响
[root@localhost project]# touch t1.txt

# 改变文件的时间戳
[root@localhost project]# touch -t 202010091130 t1.txt 
[root@localhost project]# ll
-rw-r--r--. 1 root root 4 Oct  9 11:30 t1.txt