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Full Discussion: Copy files from one drive to another, keeping most recently modified files
Top Forums UNIX for Dummies Questions & Answers Copy files from one drive to another, keeping most recently modified files Post 302898445 by apocolapse on Tuesday 22nd of April 2014 08:52:47 AM
Old 04-22-2014
Hi SriniShoo, thanks for the solution. Just so I can try to understand and assist with my scripting learning, is this what your script does?:

Code:
for i in /x/path/*    //for file i within /x/path/example/example1
do
  if [[ ! -f /y/path/${i##*/} || ${i} -nt /y/path/${i##*/} ]]; then   //if file i in /x/path/example/example1 exists then see if file i from X drive is less than file i from Y drive
    cp ${i} /y/path/${i##*/}     //if file i from X drive is less than file i from Y drive (or it doesn't exist in Y drive) copy file i from X drive to same location in Y drive.
  fi        // end if
done     // end do loop

I have a quick question, what does ${i##*/} give? And how does the script know to use date modified? Is there a command for that, or is it used by default?

Thanks!
 

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LEARN ABOUT CENTOS

volcheck

volcheck(1)							   User Commands						       volcheck(1)

NAME

       volcheck - checks for media in a drive and by default checks all floppy media

SYNOPSIS

       volcheck [-v] [-i secs] [-t secs] pathname

DESCRIPTION

       The  volcheck  utility tells Volume Management to look at each dev/pathname in sequence and determine if new media has been inserted in the
       drive.

       The default action is to volcheck all checkable media managed by volume management.

OPTIONS

       The following options are supported:

       -i secs	Set the frequency of device checking to secs seconds.  The default is 2 seconds.  The minimum frequency is 1 second.

       -t secs	Check the named device(s) for the next secs seconds.  The maximum number of seconds allowed is 28800, which is 8 hours.  The  fre-
		quency of checking is specified by -i. There is no default total time.

       -v	Verbose.

OPERANDS

       The following operands are supported:

       pathname        The path name of a media device.

EXAMPLES

       Example 1: A sample of the volcheck command.

       The following example

	       example% volcheck -v /dev/diskette
	       /dev/diskette has media

       asks Volume Management to examine the floppy drive for new media.

       The following example

	       example% volcheck -i 2 -t 600 /dev/diskette1 &

       asks Volume Management if there is a floppy in the floppy drive every 2 seconds for 600 seconds (10 minutes).

FILES

       /dev/volctl     Volume Management control port

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWvolu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       eject(1), volcancel(1), volmissing(1) rmmount(1M), vold(1M), rmmount.conf(4), vold.conf(4), attributes(5), volfs(7FS)

WARNINGS

       Due  to a hardware limitation in many floppy drives, the act of checking for media causes mechanical action in the floppy drive.   Continu-
       ous polling of the floppy drive will cause the drive to wear out. It is recommended that polling the drive only be performed during periods
       of high use.

SunOS 5.10							    21 Feb 1997 						       volcheck(1)
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