Support for ext4 should be in the same kernel release 4.11. There is now since Kernel 4.11 a new statx system call, on top of better support of Y2038 or network file systems, it also brings a few extra features like the btime or birth time (creation time) access. And via debugfs we can get the information (crtime as I'm on ext4 file system). You can see that the newer stat function has a birth field, though the output seems incorrect. So even-though it could be there, it's not accessible.įor instance on Ubuntu 12.04 LTS I get the following for a file I created today: $ echo Just another test > /tmp/mytest However most tools and API have not yet been updated to read this extra information. I know that ext4 supports this feature and also JFS and BTRFS. Some file systems support an additional entry in the inode regarding the creation time (or birth time). The answer of echox is valid but I want to add information regarding file creation time. Touch can become handy in combination with cp -u ( "copy only when the SOURCE file is newer than the destination file or when the destination file is missing") or for the creation of empty marker files. a for access time, -m for modification time) and to influence the parsing of a new given timestamp. There are some arguments to decide which timestamp to change (e.g. For example if you mount a partition with the noatime option, no access information will be written.Ī utility to change the timestamps would be touch. Remember that this sort of information depends highly on the filesystem and mount options. Stat will show you also some more information like the device, inodes, links, etc. To display this information, you can use stat which is part of the coreutils.
On a side note, does the file type here mean only regular file and simlink, not the type such as pdf, jpg, htm, txt etc? What this means is that if, for example, the source file is a regular file and the destination is a symlink, the destination file will be overwritten, regardless of timestamp. You can pass the '-update' flag to rsync which will cause it to skip files on the destination if they are newer than the file on the source, but only so long as they are the same type of file. It doesn't care which file is newer, if it is different, it gets overwritten.
#Linux file details how to
How to get and change these kinds of information by commands?.What are the differences between timestamp, modification time, and created time of a file?.I just know that ls -t and ls -f give different sorting of files and subdirectories under a directory.
0 kommentar(er)
