Getting MSSQL Command Line Access from ISQL on Ubuntu

Install freetds
sudo apt-get install freetds-bin

Check it works:
fsql -S -U

See how to use it (it pretty much matches isql and bcp).
man fisql
man freebcp

Engineer Victory Dance (the hard work was done the freetds posse and all those lovely linux peeps, but dance anyway, required action).