rsync

Rsync is a great command for keeping large directory structures aligned across different machines/drives.

Yes you could just do a backup and a restore, but this is inefficient when only 1 file has changed.

My normal Rsync command

When dealing with Unix to Unix (Including Mac) I usually use this command

 rsync -xav <from> <to>

From / To

The From/To settings are swappable meaning you can sync in both directions, what some people have issues with at times is specfying the values of From/To.

I want to move data from Server SVR1, from user Bob, And I only want Bob's data directory to my currect directory

 rsync <flags>   Bob@Svr:/home/Bob/data data

Or

 rsync <flags>   Bob@Svr:~/data data

Special ssh ports

Of course some people have a slightly more paranoid view of the world and run ssh on non-standard ports (a good idea).

At this point the standard rsync command needs to be altered.

 rsync -xavn -e "ssh -p <ssh_Port>" <from> <to>

Unix to Windows

Sometimes I need to move data from a Linux environment to a Windows env, here I do have some issues. Becuase rsync tries to set the groups.

I am assuming here that the Windows env is using a Fat or FAT32 formatted disk.

rsync -rltzuv  <from> <to>

#What the -a Means

The -a is a shortcut for "-a" which is just shorthand for all of "-rlptgoD"

  • r Recursive
  • l Links
  • t
  • g
  • o
  • D

Too much copying

Rsync at times can see to copy too many files - this is especially true if the target OS does not have the same file security options as the source. In which case this option may be best.

rsync --size-only  --progress --ignore-times --exclude-from my_exclude.file 

Here we are only checking the size of the file, plus I am using an exclude file.

The exclude file looks like this

2010/*
2011/*
2012/*
2013/*
2014/*
2015/*