touch命令:
作用：創建空文件，或者改變文件的時間戳屬性
格式: touch [option] [file]
１，同時創建一個或者多個空文件
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，創建文件，並用stat查看文件的屬性狀態信息
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個時間
Access time: 最后訪問時間，查看文件的內容時，這個時間會改變，使用cat命令查看文件時，可以看出Access time已經變了
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:最后修改時間，修改文件內容，文件的修改時間會改變。訪問時間和狀態改變時間 也發生變化
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:狀態改變時間,修改文件內容，移動文件，或者改變文件屬性等，文件的change time會發生改變.
１，移動文件( 重命名 ), change time 發生改變:
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，修改文件的權限，change time發生了改變
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時間
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修改創建后的文件的修改時間
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: -