Linux常用基本命令( touch )

touch命令:

作用：创建空文件，或者改变文件的时间戳属性

格式: touch [option] [file]

１，同时创建一个或者多个空文件

ghostwu@dev:~/linux/mkdir$ ls
ghostwu@dev:~/linux/mkdir$ touch a.txt
ghostwu@dev:~/linux/mkdir$ ls
a.txt
ghostwu@dev:~/linux/mkdir$ touch b.txt c.txt
ghostwu@dev:~/linux/mkdir$ ls
a.txt  b.txt  c.txt
ghostwu@dev:~/linux/mkdir$ touch {1..5}.txt
ghostwu@dev:~/linux/mkdir$ ls
1.txt  2.txt  3.txt  4.txt  5.txt  a.txt  b.txt  c.txt

２，创建文件，并用stat查看文件的属性状态信息

ghostwu@dev:~/linux/mkdir$ touch ghostwu.txt
ghostwu@dev:~/linux/mkdir$ stat ghostwu.txt 
  File: 'ghostwu.txt'
  Size: 0             Blocks: 0          IO Block: 4096   regular empty file
Device: 807h/2055d    Inode: 9569451     Links: 1
Access: (0664/-rw-rw-r--)  Uid: ( 1000/ ghostwu)   Gid: ( 1000/ ghostwu)
Access: 2018-05-01 17:25:16.439856937 +0800
Modify: 2018-05-01 17:25:16.439856937 +0800
Change: 2018-05-01 17:25:16.439856937 +0800
 Birth: -

最后有３个时间

Access time:　最后访问时间，查看文件的内容时，这个时间会改变，使用cat命令查看文件时，可以看出Access time已经变了

ghostwu@dev:~/linux/mkdir$ stat ghostwu.txt 
  File: 'ghostwu.txt'
  Size: 0             Blocks: 0          IO Block: 4096   regular empty file
Device: 807h/2055d    Inode: 9569451     Links: 1
Access: (0664/-rw-rw-r--)  Uid: ( 1000/ ghostwu)   Gid: ( 1000/ ghostwu)
Access: 2018-05-01 17:25:16.439856937 +0800
Modify: 2018-05-01 17:25:16.439856937 +0800
Change: 2018-05-01 17:25:16.439856937 +0800
 Birth: -
ghostwu@dev:~/linux/mkdir$ cat ghostwu.txt 
ghostwu@dev:~/linux/mkdir$ stat ghostwu.txt 
  File: 'ghostwu.txt'
  Size: 0             Blocks: 0          IO Block: 4096   regular empty file
Device: 807h/2055d    Inode: 9569451     Links: 1
Access: (0664/-rw-rw-r--)  Uid: ( 1000/ ghostwu)   Gid: ( 1000/ ghostwu)
Access: 2018-05-01 17:27:51.887215139 +0800
Modify: 2018-05-01 17:25:16.439856937 +0800
Change: 2018-05-01 17:25:16.439856937 +0800
 Birth: -

 

Modify time:最后修改时间，修改文件内容，文件的修改时间会改变。访问时间和状态改变时间　也发生变化

ghostwu@dev:~/linux/mkdir$ stat ghostwu.txt 
  File: 'ghostwu.txt'
  Size: 0             Blocks: 0          IO Block: 4096   regular empty file
Device: 807h/2055d    Inode: 9569451     Links: 1
Access: (0664/-rw-rw-r--)  Uid: ( 1000/ ghostwu)   Gid: ( 1000/ ghostwu)
Access: 2018-05-01 17:27:51.887215139 +0800
Modify: 2018-05-01 17:25:16.439856937 +0800
Change: 2018-05-01 17:25:16.439856937 +0800
 Birth: -
ghostwu@dev:~/linux/mkdir$ vim ghostwu.txt 
ghostwu@dev:~/linux/mkdir$ stat ghostwu.txt 
  File: 'ghostwu.txt'
  Size: 5             Blocks: 8          IO Block: 4096   regular file
Device: 807h/2055d    Inode: 9569550     Links: 1
Access: (0664/-rw-rw-r--)  Uid: ( 1000/ ghostwu)   Gid: ( 1000/ ghostwu)
Access: 2018-05-01 17:29:34.982228802 +0800
Modify: 2018-05-01 17:29:34.982228802 +0800
Change: 2018-05-01 17:29:35.018231392 +0800
 Birth: -

 

Change time:状态改变时间,修改文件内容，移动文件，或者改变文件属性等，文件的change time会发生改变.

１，移动文件( 重命名 ), change time 发生改变:

ghostwu@dev:~/linux/mkdir$ stat ghostwu.txt 
  File: 'ghostwu.txt'
  Size: 5             Blocks: 8          IO Block: 4096   regular file
Device: 807h/2055d    Inode: 9569550     Links: 1
Access: (0664/-rw-rw-r--)  Uid: ( 1000/ ghostwu)   Gid: ( 1000/ ghostwu)
Access: 2018-05-01 17:29:34.982228802 +0800
Modify: 2018-05-01 17:29:34.982228802 +0800
Change: 2018-05-01 17:29:35.018231392 +0800
 Birth: -
ghostwu@dev:~/linux/mkdir$ mv ghostwu.txt ghostwu2.txt
ghostwu@dev:~/linux/mkdir$ stat ghostwu2.txt 
  File: 'ghostwu2.txt'
  Size: 5             Blocks: 8          IO Block: 4096   regular file
Device: 807h/2055d    Inode: 9569550     Links: 1
Access: (0664/-rw-rw-r--)  Uid: ( 1000/ ghostwu)   Gid: ( 1000/ ghostwu)
Access: 2018-05-01 17:29:34.982228802 +0800
Modify: 2018-05-01 17:29:34.982228802 +0800
Change: 2018-05-01 17:32:25.392863791 +0800

２，修改文件的权限，change time发生了改变

ghostwu@dev:~/linux/mkdir$ stat ghostwu2.txt 
  File: 'ghostwu2.txt'
  Size: 5             Blocks: 8          IO Block: 4096   regular file
Device: 807h/2055d    Inode: 9569550     Links: 1
Access: (0664/-rw-rw-r--)  Uid: ( 1000/ ghostwu)   Gid: ( 1000/ ghostwu)
Access: 2018-05-01 17:29:34.982228802 +0800
Modify: 2018-05-01 17:29:34.982228802 +0800
Change: 2018-05-01 17:32:25.392863791 +0800
 Birth: -
ghostwu@dev:~/linux/mkdir$ chmod 777 ghostwu2.txt 
ghostwu@dev:~/linux/mkdir$ stat ghostwu2.txt 
  File: 'ghostwu2.txt'
  Size: 5             Blocks: 8          IO Block: 4096   regular file
Device: 807h/2055d    Inode: 9569550     Links: 1
Access: (0777/-rwxrwxrwx)  Uid: ( 1000/ ghostwu)   Gid: ( 1000/ ghostwu)
Access: 2018-05-01 17:29:34.982228802 +0800
Modify: 2018-05-01 17:29:34.982228802 +0800
Change: 2018-05-01 17:33:31.602584110 +0800
 Birth: -

touch -m修改文件的modify和change时间

ghostwu@dev:~/linux/mkdir$ stat ghostwu2.txt 
  File: 'ghostwu2.txt'
  Size: 5             Blocks: 8          IO Block: 4096   regular file
Device: 807h/2055d    Inode: 9569550     Links: 1
Access: (0777/-rwxrwxrwx)  Uid: ( 1000/ ghostwu)   Gid: ( 1000/ ghostwu)
Access: 2018-05-01 17:29:34.982228802 +0800
Modify: 2018-05-01 17:29:34.982228802 +0800
Change: 2018-05-01 17:33:31.602584110 +0800
 Birth: -
ghostwu@dev:~/linux/mkdir$ touch -m ghostwu2.txt 
ghostwu@dev:~/linux/mkdir$ stat ghostwu2.txt 
  File: 'ghostwu2.txt'
  Size: 5             Blocks: 8          IO Block: 4096   regular file
Device: 807h/2055d    Inode: 9569550     Links: 1
Access: (0777/-rwxrwxrwx)  Uid: ( 1000/ ghostwu)   Gid: ( 1000/ ghostwu)
Access: 2018-05-01 17:29:34.982228802 +0800
Modify: 2018-05-01 17:34:31.678864985 +0800
Change: 2018-05-01 17:34:31.678864985 +0800

touch -d修改创建后的文件的修改时间

ghostwu@dev:~/linux/mkdir$ ls -lh ghostwu2.txt 
-rwxrwxrwx 1 ghostwu ghostwu 5 5月   1 17:34 ghostwu2.txt
ghostwu@dev:~/linux/mkdir$ touch -d 20190218 ghostwu2.txt 
ghostwu@dev:~/linux/mkdir$ ls -lh ghostwu2.txt 
-rwxrwxrwx 1 ghostwu ghostwu 5 2月  18  2019 ghostwu2.txt
ghostwu@dev:~/linux/mkdir$ stat ghostwu2.txt 
  File: 'ghostwu2.txt'
  Size: 5             Blocks: 8          IO Block: 4096   regular file
Device: 807h/2055d    Inode: 9569550     Links: 1
Access: (0777/-rwxrwxrwx)  Uid: ( 1000/ ghostwu)   Gid: ( 1000/ ghostwu)
Access: 2019-02-18 00:00:00.000000000 +0800
Modify: 2019-02-18 00:00:00.000000000 +0800
Change: 2018-05-01 17:37:13.031347481 +0800
 Birth: -