As noted previously, the default command prompt in the Bourne shell family is the $ (dollar sign) and in the C shell family is the % (percent sign). You can change these by setting new values to PS1 (Bourne) or prompt (C shell). For example to change from the $ symbol as the command line prompt to the machine name as the new prompt in a Bourne shell --
$ PS1 = "Bravo:"
Bravo: echo test
test
Bravo:
Other constructs commonly found in command prompts are all or part of the current working directory and the command sequence number. Using the C shell, examples of these would look like --
set prompt="$cwd%"
set prompt="
!"