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nitins
Asked: 2013-01-16 02:55:40 +0800 CST

SFTP files not showing upload date as last modification time

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Some of the files we receive on our Redhat server are showing date different from upload date as the last modification time. For us the modification time is important as we classify files depending on date we receive it. Some of these file show earlier timestamps, maybe that of files original creation/modification date on client machine.

sftp

3 Answers

  1. Best Answer

    *nix filesystems provide 3 distinct timestamps:

    • mtime is the time the file's contents was last modified
    • ctime is the time the file's attributes were last changed
    • atime is the time the file was last accessed

    The timestamp usually shown in directory listings is the mtime, because it is the most useful; however, many FTP servers will upload a file to a temporary filename and then rename the file once complete, to avoid exposing incomplete files to the OS.

    This causes the mtime and ctime to differ for newly-created (uploaded) files; the ctime will show the time the file finished uploading and was renamed, while the mtime will show file creation time.

    If you can show some samples of what you're talking about, perhaps additional help can be offered.

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  2. When I want to change the file modification time, I use an FTP client on the console. Log on with ftp ftp.example.com, then

    • cd commands go to the correct directory
    • SITE command to move the extended command mode
    • UTIME somefile.txt 20050101123000 20050101123000 20050101123000 UTC

    Change the access time, modification time, it's time to create a directory on 2005-01-01 12:30:00 somefile.txt. Complete example:

    site UTIME somefile.txt 20150331122000 20150331122000 20150331122000 UTC
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  3. This link can help

    https://superuser.com/questions/234158/show-both-ctime-and-atime-in-ls-output

    stat -c '%x %z' filename.txt

    as answered weeheavy

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