You can use cp -u or –update options to copy only when the source file/directory is newer than the destination file/directory or when the destination file/directory is missing.
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mkdir mydir{1,2} ## create some files and directories echo "one" > mydir1/myfile1 cp -v mydir1/myfile1 mydir2/ ## myfile1 will be copied from mydir1 to mydir2 cp -uv mydir1/myfile1 mydir2/ ## does nothing echo "two" > mydir1/myfile1 cp -uv mydir1/myfile1 mydir2/ ## myfile1 will be copied from mydir1 to mydir2 rm -r my* |