The command slic -v will print slic's version and immediately exit.
[1019 $] ./slic/bin/Linux-g++/slic -v Start Time <Thu Dec 14 20:45:18 2006> Simulator for the Linear Collider; SLIC; v2r0p12; Jeremy McCormick and Ron Cassell; SLAC; Fri Dec 1 15:47:39 PST 2006