How do you change the text-cursor/caret in Terminal to block, I-Beam, or underline.
In addition to the GUI method, you can also change the cursor shape from the command-line:
$ gconftool-2 --type string --set /apps/gnome-terminal/profiles/Default/cursor_shape <VALUE>
The possible values are "block" to use a block cursor, "ibeam" to use a vertical line cursor, or "underline" to use an underline cursor.
To get the current value:
$ gconftool-2 --get /apps/gnome-terminal/profiles/Default/cursor_shape block
In recent versions of gnome-terminal, you can use the following escape sequences to change the cursor:
\e[ q: reset to whatever's defined in the profile settings
\e[1 q: blinking block
\e[2 q: steady block
\e[3 q: blinking underline
\e[4 q: steady underline
\e[5 q: blinking I-beam
\e[6 q: steady I-beam
You can print these by e.g.
echo -ne '\e[5 q'.
This has the advantage/disadvantage (based on your use case) compared to the
gconftool method that it influences the given tab only, and not all the tabs that use the given profile.