Alternative to cp command Post: 303018502

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Top Forums UNIX for Beginners Questions & Answers Alternative to cp command Post 303018502 by hicksd8 on Friday 8th of June 2018 03:35:49 AM

06-08-2018

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I think that I get the question as you've described it quite clearly. Different people will have different solutions but this is what I would do.

(Obviously, if the (original) copy takes several hours then users could be modifying files during that time so you need somehow to cope with that.)

Do the first copy using find piped to cpio and create a timestamp of the event:

Code:

# cd <source directory>
# date > timenow
# find . -depth -print | cpio -puvdm <destination directory>
# mv timenow timelastcopy

NOTE: The <destination directory> MUST already exist before the command is run otherwise it will fail, so create it manually if need be.

After the first copy, select only files that have changed since the last copy by using the -newer switch on find:

Code:

# cd <source directory>
# date > timenow
# find . -newer timelastcopy -depth -print | cpio -puvdm <destination directory>
# rm timelastcopy
# mv timenow timelastcopy

Note that we create the timestamp (timenow) before we start to copy because users might modify files whilst the copy is executing.

This way files that have not changed since before the very start of the last copy will not be copied again. The incremental copies will therefore be much quicker than a full copy. If the job fails to complete then the timelastcopy will not get updated so these files will get selected again on the next run.

Hope that helps and I hope I've explained that clear enough. If not, post back your questions.

Last edited by hicksd8; 06-08-2018 at 12:59 PM..

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LEARN ABOUT HPUX

cpio

cpio(4) 						     Kernel Interfaces Manual							   cpio(4)

NAME

       cpio - format of cpio archive

DESCRIPTION

       The header structure, when the option of is not used (see cpio(1)), is:

       When the option is used, the header information is described by:

       Longtime  and Longfile are equivalent to and respectively.  The contents of each file are recorded together with other items describing the
       file.  Every instance of contains the constant 070707 (octal).  The items through have meanings explained in stat(2).  The  length  of  the
       null-terminated path name including the null byte, is given by

       The last record of the archive always contains the name Directories and the trailer are recorded with equal to zero.

       It  will not always be the case that and correspond to the results of but the values are always sufficient to tell whether two files in the
       archive are linked to each other.

       When a device special file is archived by HP-UX (using the option), contains a magic constant which is dependent  upon  the  implementation
       doing  the writing.  flags the device file as an HP-UX 32-bit device specifier, and contains the 32-bit device specifier (see stat(2)).	If
       the option is not present, special files are not archived or restored.  Non-HPUX device special files are never restored.

SEE ALSO

       cpio(1), find(1), stat(2).

STANDARDS CONFORMANCE

																	   cpio(4)

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