Kate is a graphical text editor that comes with KDE.
The name is an acronym for KDE Advanced Text Editor.
Kate allows you to edit multiple files at once, and has a console attached which automagically changes to the directory the file being edited resides in

Kate is aware of several computer programming languages, and will highlight appropriately for at least the following:

• C
• C++
• Java
• Python
• Perl
• HTML
• Javascript
• CSS
• Ruby
• PHP

Some handy bindings
These keybindings may also work for other editors, such as Kates older sister, KWrite

ctrl d

comment the highlighted line

ctrl shift d

uncomment the highlighted line

ctrl s

save

ctrl v

paste

ctrl c

copy

ctrl x

cut the highlighted area

ctrl z

undo

ctrl k

delete line

ctrl backspace

delete word left

ctrl delete

delete word right

ctrl t

transpose characters

ctrl p

print

ctrl q

quit

ctrl w

close window

ctrl n

new

ctrl a

select all

ctrl f

find

ctrl r

replace

ctrl g

go to line

ctrl j

delete line ending

ctrl k

delete line

ctrl o

open file

ctrl i

indent line(indents all selected lines)

ctrl shift i

unindent selected lines

ctrl -

expand/collapse code loops

Movement Shortcuts

ctrl Home

Move to beginning of document

Home

Move to begginning of line

ctrl pagedown

Move to bottom of view

ctrl end

Move to end of line

ctrl 6

Move to matching bracket

ctrl pageup

Move to top of view

ctrl left

Move to word left

ctrl right

Move to word right

add the shift key to the move shortcuts to select (eg. ctrl shift home)