Update file timestamp or create new File command

Update file timestamp or create new file Touch

The document has three major change times:

Modification Time (mtime): updated when file content data is changed

Status Time (CTime): updated when file permissions and attributes are changed

Access Time (atime): updated when a file is accessed

Touch [-ACDMT] file

Parameters:

-A: Modify access time only

-C: only the time to modify the file, if the file does not exist, do not create a new file

-D:--date= Date and time specify the modified date and time to set

-M: modify mtime only

-T: the time format that can be modified after is [YYMMDDHHMM]

Example

#文件不存在则创建新的空文件 # ls The time that is displayed by default is the Mtime[[email protected] test]$ touch test_touch[[email of the file  protected] test]$ lltotal 0-rw-rw-r--.  1 roger roger 0 Aug  25 10:49 test_touch  #查看文件时间 [[email protected] test]$ stat test_touch    File:  ' Test_touch '   Size: 0          Blocks: 0          IO Block: 4096    regular empty fileDevice: fd01h/64769dInode: 1048609      Links: 1Access:  (0664/-rw-rw-r--)   Uid:  (  500/    Roger)    Gid:  (  500/   roger) access: 2015-08-25  10:49:25.663413029 +0800modify: 2015-08-25 10:49:25.663413029 +0800change: 2015-08-25  10:49:25.663413029 +0800 #  Review the contents of the file and update the Atime[[email protected] test]$ cat test_touch [[email  protected] test]$ stat test_touch   File:  ' Test_touch '    size: 0         blocks: 0           io block: 4096   regular empty filedevice:  fd01h/64769dInode: 1048609     Links: 1Access:  (0664/-rw-rw-r--)   Uid:  (  500/   roger)    Gid:  (  500/    roger) access: 2015-08-25 10:55:47.721125941 +0800modify: 2015-08-25  10:49:25.663413029 +0800Change: 2015-08-25 10:49:25.663413029 +0800 #  Atime and Mtime are updated to the specified time, ctime updated to the current time [[email protected] test]$ touch -t 1409111008  test_touch [[email protected] test]$ stat test_touch   file:  ' Test_touch '   Size:  0         Blocks: 0           io block: 4096   regular empty filedevice:  fd01h/64769dInode: 1048609     Links: 1Access:  (0664/-rw-rw-r--)   Uid:  (  500/   roger)    Gid:  (  500/    roger) access: 2014-09-11 10:08:00.000000000 +0800modify: 2014-09-11  10:08:00.000000000 +0800change: 2015-08-25 11:02:02.444495259 +0800

two features used by touch

1 Create an empty file

2 Modify a file date to the current date (mtime and atime)

If there is any mistake, please correct me!

Thank you!

Update file timestamp or create new File command