linux inotifywait 下监控是否有IO

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JDU:/host-001e67a8d50b /log/today # inotifywait -h
inotifywait 3.14
Wait for a particular event on a file or set of files.
Usage: inotifywait [ options ] file1 [ file2 ] [ file3 ] [ ... ]
Options:
    -h|--help         Show this help text.
    @<file>           Exclude the specified file from being watched.
    --exclude <pattern>
                      Exclude all events on files matching the
                      extended regular expression <pattern>.
    --excludei <pattern>
                      Like --exclude but case insensitive.
    -m|--monitor      Keep listening for events forever.  Without
                      this option, inotifywait will exit after one
                      event is received.
    -d|--daemon       Same as --monitor, except run in the background
                      logging events to a file specified by --outfile.
                      Implies --syslog.
    -r|--recursive    Watch directories recursively.
    --fromfile <file>
                      Read files to watch from <file> or `-' for stdin.
    -o|--outfile <file>
                        Print events to <file> rather than stdout.
    -s|--syslog       Send errors to syslog rather than stderr.
    -q|--quiet        Print less (only print events).
    -qq               Print nothing (not even events).
    --format <fmt>    Print using a specified printf-like format
                      string; read the man page for more details.
    --timefmt <fmt>    strftime-compatible format string for use with
                      %T in --format string.
    -c|--csv          Print events in CSV format.
        -t|--timeout <seconds>
                      When listening for a single event, time out after
                      waiting for an event  for <seconds> seconds.
                      If <seconds> is , inotifywait will never time out.
    -e|--event <event1> [ -e|--event  <event2> ... ]
        Listen for specific event(s).  If omitted, all events are
        listened for.
        Exit status:
      -  An event you asked to watch for was received.
      -  An event you did not ask to watch for was received
      -  The --timeout option was given and no events occurred
          in the specified interval of time.
Events:
    access        file or directory contents were read
    modify        file or directory contents were written
    attrib        file or directory attributes changed
        close_write    file or directory closed, after being opened in writable mode
    close_nowrite    file or directory closed, after being opened in read-only mode
        close        file or directory closed, regardless of read/write mode
    open        file or directory opened
    moved_to    file or directory moved to watched directory
    moved_from    file or directory moved from watched directory
        move        file or directory moved to or from watched directory
    create        file or directory created within watched directory
    delete        file or directory deleted within watched directory
    delete_self    file or directory was deleted
    unmount        file system containing file or directory unmounted

示例：

JDU:aSV/host-001e67a8d50b /sf # inotifywait -rme access,modify,open,close /sf/data/vs_rep2/images/
Setting up watches.  Beware: since -r was given, this may take a while!
Watches established.
/sf/data/vs_rep2/images/ OPEN,ISDIR
/sf/data/vs_rep2/images/ CLOSE_NOWRITE,CLOSE,ISDIR
/sf/data/vs_rep2/images/ OPEN,ISDIR cluster
/sf/data/vs_rep2/images/cluster/ OPEN,ISDIR
/sf/data/vs_rep2/images/ CLOSE_NOWRITE,CLOSE,ISDIR cluster
/sf/data/vs_rep2/images/cluster/ CLOSE_NOWRITE,CLOSE,ISDIR