04-03-2015
Files have filetimes - one is the last date/time the file was written to. It is called the file mtime, most often.
If you can simply look for files that match your pattern, grab the most recent one. If those files get created every hour or so it becomes even easier.
IF you give us more information about what you are trying to accomplish - NOT how to code it - we can give you very good answers.
As presented your code would skip over copying a file because there are two newer files not one. And how do you track what the last one copied over was? You don't with your code.
Please give us more to go on.
what shell?
What OS?
what do you want to accomplish? -- not how to code it.
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DU(1) FSF DU(1)
NAME
du - estimate file space usage
SYNOPSIS
du [OPTION]... [FILE]...
DESCRIPTION
Summarize disk usage of each FILE, recursively for directories.
Mandatory arguments to long options are mandatory for short options too.
-a, --all
write counts for all files, not just directories
-B, --block-size=SIZE use SIZE-byte blocks
-b, --bytes
print size in bytes
-c, --total
produce a grand total
-D, --dereference-args
dereference FILEs that are symbolic links
-h, --human-readable
print sizes in human readable format (e.g., 1K 234M 2G)
-H, --si
likewise, but use powers of 1000 not 1024
-k like --block-size=1K
-l, --count-links
count sizes many times if hard linked
-L, --dereference
dereference all symbolic links
-S, --separate-dirs
do not include size of subdirectories
-s, --summarize
display only a total for each argument
-x, --one-file-system
skip directories on different filesystems
-X FILE, --exclude-from=FILE
Exclude files that match any pattern in FILE.
--exclude=PATTERN Exclude files that match PATTERN.
--max-depth=N
print the total for a directory (or file, with --all) only if it is N or fewer levels below the command line argument;
--max-depth=0 is the same as --summarize
--help display this help and exit
--version
output version information and exit
SIZE may be (or may be an integer optionally followed by) one of following: kB 1000, K 1024, MB 1,000,000, M 1,048,576, and so on for G, T,
P, E, Z, Y.
PATTERNS
PATTERN is a shell pattern (not a regular expression). The pattern ? matches any one character, whereas * matches any string (composed of
zero, one or multiple characters). For example, *.o will match any files whose names end in .o. Therefore, the command
du --exclude='*.o'
will skip all files and subdirectories ending in .o (including the file .o itself).
AUTHOR
Written by Torbjorn Granlund, David MacKenzie, Larry McVoy, and Paul Eggert.
REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>.
COPYRIGHT
Copyright (C) 2002 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
LAR PURPOSE.
SEE ALSO
The full documentation for du is maintained as a Texinfo manual. If the info and du programs are properly installed at your site, the com-
mand
info du
should give you access to the complete manual.
du (coreutils) 4.5.3 February 2003 DU(1)