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Full Discussion: [bash] Simple backup (cp) script but incremental
Top Forums Shell Programming and Scripting [bash] Simple backup (cp) script but incremental Post 302343546 by mrtiller on Wednesday 12th of August 2009 10:17:19 PM
Old 08-12-2009
At the beginning of the backup process, use the "touch" command to create a file called, say, "timestamp." This file will have a modification time corresponding to when the "touch" command was executed.

Code:
touch timestamp

then, use the -newer switch in the find command of the backup:

Code:
find . -newer timestamp ...

This will find only the files and directories newer than the file "timestamp."

If you're sure no files will be created after commencing the backup, you could execute the "touch" command after the "find" command instead of before it.
 

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LEARN ABOUT SUNOS

touch

touch(1B)					     SunOS/BSD Compatibility Package Commands						 touch(1B)

NAME

       touch - change file access and modification times

SYNOPSIS

       /usr/ucb/touch [-acfm] file...

DESCRIPTION

       touch sets the access and modification times of each file to the current time. file is created if it does not already exist.

OPTIONS

       -a	Change the access time of file. Do not change the modification time unless -m is also specified.

       -c	Do not create file if it does not exist.

       -f	Attempt to force the touch in spite of read and write permissions on file.

       -m	Change the modification time of file. Do not change the access time unless -a is also specified.

USAGE

       See largefile(5) for the description of the behavior of touch when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).

EXIT STATUS

       The following exit values are returned:

       0	touch executed successfully and all requested changes were made.

       >0	An error occurred. touch returns the number of files for which the times could not be successfully modified.

ATTRIBUTES

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWscpu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       touch(1), attributes(5), largefile(5)

SunOS 5.10							    26 Oct 1995 							 touch(1B)
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