导读 touch命令作用:创建空文件,或者改变文件的时间戳属性

适用场景:

如果创建一个新文件有很多种方法,比如:

vi file
cat > file
echo "hello,world" > file
touch  file
touch命令不仅可以创建新文件,而且可以修改文件的时间属性;


格式: touch [option] [file]

备注:

1) -t选项的时间格式[[CC]YY]MMDDhhmm[.ss]说明:

2) touch命令的几点说明:

1,同时创建一个或者多个空文件
linuxidc@linuxidc:~/linux/mkdir$ ls
linuxidc@linuxidc:~/linux/mkdir$ touch a.txt
linuxidc@linuxidc:~/linux/mkdir$ ls
a.txt
linuxidc@linuxidc:~/linux/mkdir$ touch b.txt c.txt
linuxidc@linuxidc:~/linux/mkdir$ ls
a.txt  b.txt  c.txt
linuxidc@linuxidc:~/linux/mkdir$ touch {1..5}.txt
linuxidc@linuxidc:~/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
linuxidc@linuxidc:~/linux/mkdir$ touch linuxidc.txt
linuxidc@linuxidc:~/linux/mkdir$ stat linuxidc.txt 
  File: 'linuxidc.txt'
  Size: 0            Blocks: 0          IO Block: 4096  regular empty file
linuxidcice: 807h/2055d    Inode: 9569451    Links: 1
Access: (0664/-rw-rw-r--)  Uid: ( 1000/ linuxidc)  Gid: ( 1000/ linuxidc)
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

linuxidc@linuxidc:~/linux/mkdir$ stat linuxidc.txt 
  File: 'linuxidc.txt'
  Size: 0            Blocks: 0          IO Block: 4096  regular empty file
linuxidcice: 807h/2055d    Inode: 9569451    Links: 1
Access: (0664/-rw-rw-r--)  Uid: ( 1000/ linuxidc)  Gid: ( 1000/ linuxidc)
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: -
linuxidc@linuxidc:~/linux/mkdir$ cat linuxidc.txt 
linuxidc@linuxidc:~/linux/mkdir$ stat linuxidc.txt 
  File: 'linuxidc.txt'
  Size: 0            Blocks: 0          IO Block: 4096  regular empty file
linuxidcice: 807h/2055d    Inode: 9569451    Links: 1
Access: (0664/-rw-rw-r--)  Uid: ( 1000/ linuxidc)  Gid: ( 1000/ linuxidc)
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

linuxidc@linuxidc:~/linux/mkdir$ stat linuxidc.txt 
  File: 'linuxidc.txt'
  Size: 0            Blocks: 0          IO Block: 4096  regular empty file
linuxidcice: 807h/2055d    Inode: 9569451    Links: 1
Access: (0664/-rw-rw-r--)  Uid: ( 1000/ linuxidc)  Gid: ( 1000/ linuxidc)
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: -
linuxidc@linuxidc:~/linux/mkdir$ vim linuxidc.txt 
linuxidc@linuxidc:~/linux/mkdir$ stat linuxidc.txt 
  File: 'linuxidc.txt'
  Size: 5            Blocks: 8          IO Block: 4096  regular file
linuxidcice: 807h/2055d    Inode: 9569550    Links: 1
Access: (0664/-rw-rw-r--)  Uid: ( 1000/ linuxidc)  Gid: ( 1000/ linuxidc)
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:
linuxidc@linuxidc:~/linux/mkdir$ stat linuxidc.txt 
  File: 'linuxidc.txt'
  Size: 5            Blocks: 8          IO Block: 4096  regular file
linuxidcice: 807h/2055d    Inode: 9569550    Links: 1
Access: (0664/-rw-rw-r--)  Uid: ( 1000/ linuxidc)  Gid: ( 1000/ linuxidc)
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: -
linuxidc@linuxidc:~/linux/mkdir$ mv linuxidc.txt linuxidc2.txt
linuxidc@linuxidc:~/linux/mkdir$ stat linuxidc2.txt 
  File: 'linuxidc2.txt'
  Size: 5            Blocks: 8          IO Block: 4096  regular file
linuxidcice: 807h/2055d    Inode: 9569550    Links: 1
Access: (0664/-rw-rw-r--)  Uid: ( 1000/ linuxidc)  Gid: ( 1000/ linuxidc)
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
linuxidc@linuxidc:~/linux/mkdir$ stat linuxidc2.txt 
  File: 'linuxidc2.txt'
  Size: 5            Blocks: 8          IO Block: 4096  regular file
linuxidcice: 807h/2055d    Inode: 9569550    Links: 1
Access: (0664/-rw-rw-r--)  Uid: ( 1000/ linuxidc)  Gid: ( 1000/ linuxidc)
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: -
linuxidc@linuxidc:~/linux/mkdir$ chmod 777 linuxidc2.txt 
linuxidc@linuxidc:~/linux/mkdir$ stat linuxidc2.txt 
  File: 'linuxidc2.txt'
  Size: 5            Blocks: 8          IO Block: 4096  regular file
linuxidcice: 807h/2055d    Inode: 9569550    Links: 1
Access: (0777/-rwxrwxrwx)  Uid: ( 1000/ linuxidc)  Gid: ( 1000/ linuxidc)
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

linuxidc@linuxidc:~/linux/mkdir$ stat linuxidc2.txt 
  File: 'linuxidc2.txt'
  Size: 5            Blocks: 8          IO Block: 4096  regular file
linuxidcice: 807h/2055d    Inode: 9569550    Links: 1
Access: (0777/-rwxrwxrwx)  Uid: ( 1000/ linuxidc)  Gid: ( 1000/ linuxidc)
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: -
linuxidc@linuxidc:~/linux/mkdir$ touch -m linuxidc2.txt 
linuxidc@linuxidc:~/linux/mkdir$ stat linuxidc2.txt 
  File: 'linuxidc2.txt'
  Size: 5            Blocks: 8          IO Block: 4096  regular file
linuxidcice: 807h/2055d    Inode: 9569550    Links: 1
Access: (0777/-rwxrwxrwx)  Uid: ( 1000/ linuxidc)  Gid: ( 1000/ linuxidc)
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

linuxidc@linuxidc:~/linux/mkdir$ ls -lh linuxidc2.txt 
-rwxrwxrwx 1 linuxidc linuxidc 5 5月  1 17:34 linuxidc2.txt
linuxidc@linuxidc:~/linux/mkdir$ touch -d 20190218 linuxidc2.txt 
linuxidc@linuxidc:~/linux/mkdir$ ls -lh linuxidc2.txt 
-rwxrwxrwx 1 linuxidc linuxidc 5 2月  18  2019 linuxidc2.txt
linuxidc@linuxidc:~/linux/mkdir$ stat linuxidc2.txt 
  File: 'linuxidc2.txt'
  Size: 5            Blocks: 8          IO Block: 4096  regular file
linuxidcice: 807h/2055d    Inode: 9569550    Links: 1
Access: (0777/-rwxrwxrwx)  Uid: ( 1000/ linuxidc)  Gid: ( 1000/ linuxidc)
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: -

原文来自:https://www.linuxidc.com/Linux/2018-09/153844.htm

本文地址: https://www.linuxprobe.com/linux-touch-command.html编辑:王健达,审核员:逄增宝