sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 8756C4F765C9AC3CB6B85D62379CE192D401AB61
echo deb http://dl.bintray.com/seafile-org/deb jessie main | sudo tee /etc/apt/sources.list.d/seafile.list
sudo apt-get update
apt-get install seafile-cli

Now setup cli:
# choose a folder where to store the seafile client settings e.g ~/seafile-client

mkdir ~/seafile-client            # create the settings folder
seaf-cli init -d ~/seafile-client  # initialise seafile client with this folder
seaf-cli start

seaf-cli is command line interface for seafile client.
Subcommands:
    init:           create config files for seafile client
    start:          start and run seafile client as daemon
    stop:           stop seafile client
    list:           list local liraries
    status:         show syncing status
    download:       download a library from seafile server
    sync:           synchronize an existing folder with a library in
                        seafile server
    desync:         desynchronize a library with seafile server
    create:         create a new library
Detail
======
Seafile client stores all its configure information in a config dir. The default location is `~/.ccnet`. All the commands below accept an option `-c <config-dir>`.
init
----
Initialize seafile client. This command initializes the config dir. It also creates sub-directories `seafile-data` and `seafile` under `parent-dir`. `seafile-data` is used to store internal data, while `seafile` is used as the default location put downloaded libraries.
    seaf-cli init [-c <config-dir>] -d <parent-dir>
start
-----
Start seafile client. This command start `ccnet` and `seaf-daemon`, `ccnet` is the network part of seafile client, `seaf-daemon` manages the files.
    seaf-cli start [-c <config-dir>]
stop
----
Stop seafile client.
    seaf-cli stop [-c <config-dir>]
Download
--------
Download a library from seafile server
    seaf-cli download -l <library-id> -s <seahub-server-url> -d <parent-directory> -u <username> -p <password>
sync
----
Synchronize a library with an existing folder.
    seaf-cli sync -l <library-id> -s <seahub-server-url> -d <existing-folder> -u <username> -p <password>

First retrieve the library id by browsing on the server -> it's in the url after "/repo/"

usage: seaf-cli sync [-h] [-c CONFDIR] [-l LIBRARY] [-s SERVER] [-u USERNAME]
                     [-p PASSWORD] [-d FOLDER]

optional arguments:
  -h, --help            show this help message and exit
  -c CONFDIR, --confdir CONFDIR
                        the config directory
  -l LIBRARY, --library LIBRARY
                        library id
  -s SERVER, --server SERVER
                        URL for seafile server
  -u USERNAME, --username USERNAME
                        username
  -p PASSWORD, --password PASSWORD
                        password
  -d FOLDER, --folder FOLDER
                        the existing local folder


desync
------
Desynchronize a library from seafile server
    seaf-cli desync -d <existing-folder>
create
------
Create a new library
    seaf-cli create -s <seahub-server-url> -n <library-name> -u <username> -p <password> -t <description> [-e <library-password>]
'''

Get library id:

seaf-cli list-remote -s  "https://cloud.joel.co.in" -u "[email protected]" -p "mypassword"
Name    ID
My Library d9d122233-43b6-4af3-21dde-59aawwwww45df11

Now download to local folder:

seaf-cli download -l "d9d122233-43b6-4af3-21dde-59aawwwww45df1" -s  "https://cloud.joel.co.in" -d /tmp/lib -u "[email protected]" -p "mypassword"
Starting to download ...
Library d9d122233-43b6-4af3-21dde-59aawwwww45df1 will be downloaded to /tmp/lib

Now add to this directory:

cp /tmp/att/* /tmp/lib/My\ Library/Shanghumukham-April\ 2017/Arun/

You dont need to upload/sync after adding files. The daemon automatically does that. In fact, if you attempt to sync you get an error:

seaf-cli sync -l "d9d122233-43b6-4af3-21dde-59aawwwww45df1" -s  "https://cloud.joel.co.in" -d /tmp/lib -u "[email protected]" -p "mypassword"
Starting to download ...
Traceback (most recent call last):
  File "/usr/bin/seaf-cli", line 832, in <module>
    main()
  File "/usr/bin/seaf-cli", line 828, in main
    args.func(args)
  File "/usr/bin/seaf-cli", line 568, in seaf_sync
    email, random_key, enc_version, more_info)
  File "/usr/lib/python2.7/dist-packages/pysearpc/client.py", line 112, in newfunc
    return fret(ret_str)
  File "/usr/lib/python2.7/dist-packages/pysearpc/client.py", line 25, in _fret_string
    raise SearpcError(dicts['err_msg'])
pysearpc.common.SearpcError: Repo already exists

It may be a good option to desync at the end lest you end up deleting needed folders/files.

Stopping sync:

seaf-cli desync -d /tmp/lib/My\ Library

Syncing to existing local library after desyncing:

seaf-cli sync -l "d9d122233-43b6-4af3-21dde-59aawwwww45df1" -d /root/SeafileLocalSync -s  "https://cloud.joel.co.in" -u "[email protected]"

More information from the Wiki:

Seafile client for a Cli server
Installation
You can follow this documentaion to install Seafile CLI client on various Linux distributions.

Basic Usage
Initialise & start the client

# choose a folder where to store the seafile client settings e.g ~/seafile-client
mkdir ~/seafile-client            # create the settings folder
seaf-cli init -d ~/seafile-client  # initialise seafile client with this folder
seaf-cli start
Download a library from a server

retrieve the library id by browsing on the server -> it's in the url after /repo/
then
seaf-cli download -l "the id of the library" -s  "the url + port of server" -d "the folder where the library folder will be downloaded" -u "username on server" [-p "password"]
seaf-cli status  # check status of ongoing downloads
# Name  Status  Progress
# Apps    downloading     9984/10367, 9216.1KB/s
Note: if you not supply the password parameter in the command, it will be asked later, which is more safe.

Example: `seaf-cli download -l 0536c006-8a43-449e-8718-39f12111620d -s http://cloud.seafile.com -d /tmp -u [email protected]`
Download a library from a server and sync with an existing folder.

# This is the same as download : replace download by sync 
seaf-cli sync -l "the id of the library" -s  "the url + port of server" -d "the folder where the library will be synced with" -u "username on server" -p "password"
Man documentation
seaf-cli is command line interface for seafile client.

Subcommands:

init                Initialize config directory
start               Start ccnet and seafile daemon
stop                Stop ccnet and seafile daemon
list                List local libraries
list-remote         List remote libraries
status              Show syncing status
download            Download a library from seafile server
download-by-name    Download a library defined by name from seafile server
sync                Sync a library with an existing foler
desync              Desync a library with seafile server
create              Create a library
config              Configure seafile client
Running seaf-cli -h will show the above help. For each subcommand, you can also use -h option to get help, e.g. seaf-cli download -h.

Detail
Seafile client stores all its configure information in a config dir. The default location is ~/.ccnet. All the commands below accept an option -c <config-dir>.

init
Initialize seafile client. This command initializes the config dir. It also creates sub-directories seafile-data and seafile under parent-dir. seafile-data is used to store internal data, while seafile is used as the default location put downloaded libraries.

seaf-cli init [-c <config-dir>] -d <parent-dir>
A file named seafile.ini will be created under ~/.ccnet to record the location of seafile-data directory.

If you want to run multiple instances of Seafile cli client in the same machine, you can specify different config-dir and parent-dir when initializing different client instances. Then the instances can run without interfering each others. When starting the instances, just specify ccnet config directories with the -c option.

start
Start seafile client. This command start ccnet and seaf-daemon, ccnet is the network part of seafile client, seaf-daemon manages the files.

seaf-cli start [-c <config-dir>]
stop
Stop seafile client.

seaf-cli stop [-c <config-dir>]
Download
Download a library from seafile server

seaf-cli download -l <library-id> -s <seahub-server-url> -d <parent-directory> -u <username> [-p <password>]
sync
Synchronize a library with an existing folder.

seaf-cli sync -l <library-id> -s <seahub-server-url> -d <existing-folder> -u <username> [-p <password>]
desync
Desynchronize a library from seafile server

seaf-cli desync -d <existing-folder>
create
Create a new library on server

seaf-cli create [-h] -n library-name -t description [-e library-password] -s server -u username -p password
Skip SSL certificate verify
If you're using self-signed certificate on the server, you should ask the client to skip verifying certificate.

seaf-cli config -k disable_verify_certificate -v true
Set Transfer Speed Limit
Set upload speed limit to 1MB/s :

seaf-cli config -k upload_limit -v 1000000
Set download speed limit to 1MB/s :

seaf-cli config -k download_limit -v 1000000

To sync your Dropbox folder to a new library in Seafile, create a library in Seafile named Dropbox. Then install Dropbox headless on the server and start the daemon:

64-bit:

cd ~ && wget -O - "https://www.dropbox.com/download?plat=lnx.x86_64" | tar xzf -

Next, run the Dropbox daemon from the newly created .dropbox-dist folder. You will need to authorize after starting the daemon:

~/.dropbox-dist/dropboxd

Dowload the Dropbox helper python script if you want fine grained control:
wget https://www.dropbox.com/download?dl=packages/dropbox.py
mv download\?dl\=packages%2Fdropbox.py dropbox.py
chmod +x dropbox.py
./dropbox.py

Now create a library in Seafile, note its library id (the sequence after /lib/)
Make seafile sync to existing Drobox directory

seaf-cli sync -l [libid] -s "https://cloud.yoursom.com" -u [Username] -d ~/Dropbox

To sync Google Drive:
First install the cli:
apt-get install git cmake build-essential libgcrypt11-dev libyajl-dev \
libboost-all-dev libcurl4-openssl-dev libexpat1-dev libcppunit-dev binutils-dev
git clone https://github.com/Grive/grive.git
cd grive
dpkg-buildpackage -j4 -uc -us
dpkg -i ../grive*deb
mkdir ~/GoogleDrive
cd ~/GoogleDrive
grive -a
seaf-cli sync -l [libid] -s “https://cloud.yoursom.com” -u [Username] -d ~/GoogleDrive
grive &
[/bash]

grive doesnt run as a daemon, so create a cron job to sync files every 5 minutes:

*/5 * * * * cd /root/GoogleDrive && /usr/bin/grive