Scriptable command line access to SQL-Server from linux
I found tsql and while its main purpose may lie elsewhere it covers my needs.

It is included in the EPEL package. I installed it with this:
rpm -Uvh http://ftp.df.lth.se/pub/fedora-epel/6/x86_64/epel-release-6-7.noarch.rpm


FreeTDS(May 14, 2011)                                    FreeTDS(May 14, 2011)

NAME
       tsql - utility to test FreeTDS connections and queries

SYNOPSIS
       tsql   { -S servername [-I interface] | -H hostname -p port }
              -U username [-P password] [-o options]

       tsql   -C

DESCRIPTION
       tsql  is  a diagnostic tool provided as part of FreeTDS. It uses the TDS protocol directly to con-
       nect to Sybase or Microsoft SQL Servers, and allows the user to issue queries that test the  capa-
       bilities of FreeTDS.

       tsql  is  *not* a replacement for a complete isql, such as sqsh (www.sqsh.org).  It is designed to
       rely on the lowest level FreeTDS library, tdslib, as a way to isolate potential bugs in the proto-
       col implementation.