Help compile C (sshpass) application:

opkg update
opkg install tar
wget http://pkgs.fedoraproject.org/repo/pkgs/sshpass/sshpass-1.05.tar.gz/c52d65fdee0712af6f77eb2b60974ac7/sshpass-1.05.tar.gz
tar -zxvf sshpass-1.05.tar.gz
cd sshpass-1.05
./configure
make 
make install

Download prebuild sshpass:

cd /bin 
wget https://www.dropbox.com/s/bl6vyhd5jpim6zm/sshpass --no-check-certificate
chmod 755 sshpass

Usage:

sshpass -p "YOUR_PASSWORD" ssh YOUR_USERNAME@SOME_SITE.COM "ls -al"