It's fairly likely that you already have a personalized setting for PS1, the default bash interaction prompt. But what about the others available: PS2, PS3, and PS4?
PS1 is the default interaction prompt. To set it to give you
export PS1="u@h w$ "
PS2 is the prompt you get when you extend a command over multiple lines by putting at the end of a line and hitting return. By default it's just >, but you can make this a little more obvious with:
export PS2="more -> "so it looks like:
juliet@glade:~ $ very-long-command-here more -> -with -lots -of -options
PS3 governs the prompt that shows up if you use the select statement in a shell script. The default is #?, so if you do nothing to change that, the select statement will print out the options and then just leave that prompt. Alternatively, use this:
PS3="Choose an option: " select i in yes maybe no do # code to handle reply done
1) yes 2) maybe 3) no Choose an option:
Finally, PS4 is the prompt shown when you set the debug mode on a shell script using set -x at the top of the script. This echoes each line of the script to STDOUT before executing it. The default prompt is ++. More usefully, you can set it to display the line number, with:
export PS4='$LINENO+ '
All of these can be made to be permanent changes by setting them in your ~/.bash_profile or ~/.bashrc file. (Note that this probably makes little sense to do for PS3, which is better to set per-script.)