Bash vs cshell
Ubuntu comes with the BASH shell (i.e. when you open a terminal, you must type in BASH). You know this is the case because your prompt is a dollar sign ($). If you'd like to change to CSHELL, type csh, or tcsh on the command line, and you will get the carrot prompt (>). Incidentally, tcl, the scripting language of flooxs, gives you a percent (%) sign as a prompt (in case you want to test tcl commands, you can start a tcl shell by typing tclsh on the command line). Finally, the program "flooxs" gives you a flooxs prompt that looks like this: flooxs>