UNIX Command to sync files between 2 hosts - RSYNC

Rsync, which is also called Remote sync command is used when you want to sync the local files into remote server. 

Usage: rsync [OPTION]... SRC [SRC]... DEST

  or   rsync [OPTION]... SRC [SRC]... [USER@]HOST:DEST

  or   rsync [OPTION]... SRC [SRC]... [USER@]HOST::DEST

  or   rsync [OPTION]... SRC [SRC]... rsync://[USER@]HOST[:PORT]/DEST

  or   rsync [OPTION]... [USER@]HOST:SRC [DEST]

  or   rsync [OPTION]... [USER@]HOST::SRC [DEST]

  or   rsync [OPTION]... rsync://[USER@]HOST[:PORT]/SRC [DEST]

The ':' usages connect via remote shell, while '::' & 'rsync://' usages connect

to an rsync daemon, and require SRC or DEST to start with a module name.

Options

 -v, --verbose               increase verbosity

 -q, --quiet                 suppress non-error messages

     --no-motd               suppress daemon-mode MOTD (see manpage caveat)

 -c, --checksum              skip based on checksum, not mod-time & size

 -a, --archive               archive mode; same as -rlptgoD (no -H)

     --no-OPTION             turn off an implied OPTION (e.g. --no-D)

 -r, --recursive             recurse into directories

 -R, --relative              use relative path names

     --no-implied-dirs       don't send implied dirs with --relative

 -b, --backup                make backups (see --suffix & --backup-dir)

     --backup-dir=DIR        make backups into hierarchy based in DIR

     --suffix=SUFFIX         set backup suffix (default ~ w/o --backup-dir)

 -u, --update                skip files that are newer on the receiver

     --inplace               update destination files in-place (SEE MAN PAGE)

     --append                append data onto shorter files

 -d, --dirs                  transfer directories without recursing

 -l, --links                 copy symlinks as symlinks

 -L, --copy-links            transform symlink into referent file/dir

     --copy-unsafe-links     only "unsafe" symlinks are transformed

     --safe-links            ignore symlinks that point outside the source tree

 -k, --copy-dirlinks         transform symlink to a dir into referent dir

 -K, --keep-dirlinks         treat symlinked dir on receiver as dir

 -H, --hard-links            preserve hard links

 -p, --perms                 preserve permissions

     --executability         preserve the file's executability

     --chmod=CHMOD           affect file and/or directory permissions

 -o, --owner                 preserve owner (super-user only)

 -g, --group                 preserve group

     --devices               preserve device files (super-user only)

     --specials              preserve special files

 -D                          same as --devices --specials

 -t, --times                 preserve times

 -O, --omit-dir-times        omit directories when preserving times

     --super                 receiver attempts super-user activities

 -S, --sparse                handle sparse files efficiently

 -n, --dry-run               show what would have been transferred

 -W, --whole-file            copy files whole (without rsync algorithm)

 -x, --one-file-system       don't cross filesystem boundaries

 -B, --block-size=SIZE       force a fixed checksum block-size

 -e, --rsh=COMMAND           specify the remote shell to use

     --rsync-path=PROGRAM    specify the rsync to run on the remote machine

     --existing              skip creating new files on receiver

     --ignore-existing       skip updating files that already exist on receiver

     --remove-source-files   sender removes synchronized files (non-dirs)

     --del                   an alias for --delete-during

     --delete                delete extraneous files from destination dirs

     --delete-before         receiver deletes before transfer (default)

     --delete-during         receiver deletes during transfer, not before

     --delete-after          receiver deletes after transfer, not before

     --delete-excluded       also delete excluded files from destination dirs

     --ignore-errors         delete even if there are I/O errors

     --force                 force deletion of directories even if not empty

     --max-delete=NUM        don't delete more than NUM files

     --max-size=SIZE         don't transfer any file larger than SIZE

     --min-size=SIZE         don't transfer any file smaller than SIZE

     --partial               keep partially transferred files

     --partial-dir=DIR       put a partially transferred file into DIR

     --delay-updates         put all updated files into place at transfer's end

 -m, --prune-empty-dirs      prune empty directory chains from the file-list

     --numeric-ids           don't map uid/gid values by user/group name

     --timeout=TIME          set I/O timeout in seconds

 -I, --ignore-times          don't skip files that match in size and mod-time

     --size-only             skip files that match in size

     --modify-window=NUM     compare mod-times with reduced accuracy

 -T, --temp-dir=DIR          create temporary files in directory DIR

 -y, --fuzzy                 find similar file for basis if no dest file

     --compare-dest=DIR      also compare destination files relative to DIR

     --copy-dest=DIR         ... and include copies of unchanged files

     --link-dest=DIR         hardlink to files in DIR when unchanged

 -z, --compress              compress file data during the transfer

     --compress-level=NUM    explicitly set compression level

 -C, --cvs-exclude           auto-ignore files the same way CVS does

 -f, --filter=RULE           add a file-filtering RULE

 -F                          same as --filter='dir-merge /.rsync-filter'

                             repeated: --filter='- .rsync-filter'

     --exclude=PATTERN       exclude files matching PATTERN

     --exclude-from=FILE     read exclude patterns from FILE

     --include=PATTERN       don't exclude files matching PATTERN

     --include-from=FILE     read include patterns from FILE

     --files-from=FILE       read list of source-file names from FILE

 -0, --from0                 all *-from/filter files are delimited by 0s

     --address=ADDRESS       bind address for outgoing socket to daemon

     --port=PORT             specify double-colon alternate port number

     --sockopts=OPTIONS      specify custom TCP options

     --blocking-io           use blocking I/O for the remote shell

     --stats                 give some file-transfer stats

 -8, --8-bit-output          leave high-bit chars unescaped in output

 -h, --human-readable        output numbers in a human-readable format

     --progress              show progress during transfer

 -P                          same as --partial --progress

 -i, --itemize-changes       output a change-summary for all updates

     --out-format=FORMAT     output updates using the specified FORMAT

     --log-file=FILE         log what we're doing to the specified FILE

     --log-file-format=FMT   log updates using the specified FMT

     --password-file=FILE    read password from FILE

     --list-only             list the files instead of copying them

     --bwlimit=KBPS          limit I/O bandwidth; KBytes per second

     --write-batch=FILE      write a batched update to FILE

     --only-write-batch=FILE like --write-batch but w/o updating destination

     --read-batch=FILE       read a batched update from FILE

     --protocol=NUM          force an older protocol version to be used

 -E, --extended-attributes   copy extended attributes

     --cache                 disable fcntl(F_NOCACHE)

 -4, --ipv4                  prefer IPv4

 -6, --ipv6                  prefer IPv6

     --version               print version number

(-h) --help                  show this help (-h works with no other options)