Looks to me like some commands used within a TCL script.
Please refer to the Cadence command reference manual for details, read it, take some time and do some investigation.
The -logfile, -SNAPSHOT and -work looks like various switches for the ncelab command.
The "tb_com.TEST_TOP" looks like some top-level test bench....but I cannot comment on such things, it is not my design, it is your design and you should be aware of what you are using.