Updating with a delta file linux
This option changes this to compare a 128-bit checksum for each file that has a matching size.Generating the checksums means that both sides will expend a lot of disk I/O reading all the data in the files in the transfer (and this is prior to any reading that will be done to transfer changed files), so this can slow things down significantly.rsync is a fast and extraordinarily versatile file copying tool.It can copy locally, to/from another host over any remote shell, or to/from a remote rsync daemon.This is normally 0 (for an exact match), but you may find it useful to set this to a larger value in some situations.In particular, when transferring to or from an MS Windows FAT filesystem (which represents times with a 2-second resolution), --modify-window=1 is useful (allowing times to differ by up to 1 second).
If the option takes a parameter, the parameter is only listed after the long variant, even though it must also be specified for the short.Keep in mind that a leading tilde (~) in a file name is substituted by your shell, so --option=~/foo will not change the tilde into your home directory (remove the ’=’ for that).Print a short help page describing the options available in rsync and exit.For backward-compatibility with older versions of rsync, the help will also be output if you use the -h option without any other args. This option increases the amount of information you are given during the transfer. A single -v gives you information about what files are being transferred and a brief summary at the end.Two -v options give you information on what files are being skipped and slightly more information at the end.