1. Introduction Whether the creation time of a file in Linux can be found depends on the file system type. In early file systems before ext4 (ext, ext2, ext3), the file's metadata does not record the creation time of the file, it only records the access time, modification time, and change time (status change time). The basic information of a typical file is as follows: [root@bugwz ~]# stat test.file File: 'test.file' Size: 2 Blocks: 8 IO Blocks: 4096 regular file Device: 807h/2055d Inode: 5255117 Links: 1 Access: (0755/-rwxr-xr-x) Uid: (0/root) Gid: (0/root) Access: 2019-12-12 19:11:33.175841399 +0800 Modify: 2019-12-12 19:11:37.564970487 +0800 Change: 2019-12-12 19:11:43.079132663 +0800 Birth: -
2. Practice 2.1. Get the creation time of the file Get the file inode number, as shown below, the inode number is: 5255117; [root@bugwz data]# stat /data/test.file File: '/data/test.file' Size: 2 Blocks: 8 IO Blocks: 4096 regular file Device: 807h/2055d Inode: 5255117 Links: 1 Access: (0755/-rwxr-xr-x) Uid: (0/root) Gid: (0/root) Access: 2019-12-12 19:11:33.175841399 +0800 Modify: 2019-12-12 19:11:37.564970487 +0800 Change: 2019-12-12 19:11:43.079132663 +0800 Birth: - Find the disk path where the file is located, as shown below, the disk path is: /dev/sda7 [root@bugwz data]# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda3 3.9G 2.5G 1.2G 70% / devtmpfs 16G 0 16G 0% /dev tmpfs 16G 0 16G 0% /dev/shm tmpfs 16G 1.7G 14G 11% /run tmpfs 16G 0 16G 0% /sys/fs/cgroup /dev/sda1 12G 11G 787M 94% /usr /dev/sda5 7.8G 4.2G 3.2G 57% /tmp /dev/sda7 235G 180G 44G 81% /data /dev/sda6 7.8G 2.1G 5.3G 29% /var Use debugfs to view the creation time of the file and find that the creation time crtime is: Thu Dec 12 19:05:23 2019 [root@bugwz data1]# debugfs -R 'stat <5255117>' /dev/sda7 debugfs 1.42.9 (28-Dec-2013) Inode: 5255117 Type: regular Mode: 0755 Flags: 0x80000 Generation: 758605841 Version: 0x00000000:00000001 User: 0 Group: 0 Size: 2 File ACL: 0 Directory ACL: 0 Links: 1 Blockcount: 8 Fragment: Address: 0 Number: 0 Size: 0 ctime: 0x5df2206f:12dddfdc -- Thu Dec 12 19:11:43 2019 atime: 0x5df22065:29ec81dc -- Thu Dec 12 19:11:33 2019 mtime: 0x5df22069:86b30fdc -- Thu Dec 12 19:11:37 2019 crtime: 0x5df21ef3:d586ca44 -- Thu Dec 12 19:05:23 2019 Size of extra inode fields: 28 EXTENTS: (0):16949121 2.2. Integration script: #!/bin/sh [ $# -ne 1 ] && echo "Usage: $0 {FILENAME}" && exit 1 INODE=`ls -i $1 |awk '{print $1}'` FILENAME=$1 # If the parameter contains /, get the directory path of the parameter and enter the directory `echo $FILENAME | grep / 1> /dev/null` && { FPWD=${FILENAME%/*};FPWD=${FPWD:=/};cd ${FPWD};FPWD=`pwd`; } || FPWD=`pwd` array=(`echo ${FPWD} | sed 's@/@ @g'`) array_length=${#array[@]} for ((i=${array_length};i>=0;i--)); do unset array[$i] SUBPWD=`echo " "${array[@]} | sed 's@ @/@g'` DISK=`df -h |grep ${SUBPWD}$ |awk '{print $1}'` [[ -n $DISK ]] && break done # Exit if the file system is not ext4 [[ "`df -T | grep ${DISK} |awk '{print $2}'`" != "ext4" ]] && { echo ${DISK} is not mount on type ext4! Only ext4 file system support!;exit 2; } debugfs -R "stat <${INODE}>" ${DISK} Reference address: https://www.jb51.net/article/176316.htm Summarize The above is the full content of this article. I hope that the content of this article will have certain reference learning value for your study or work. Thank you for your support of 123WORDPRESS.COM. You may also be interested in:
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