Tips on IDEs (Integrated Development Environment)

IntelliJ IDEA

Open a file in a new window: CTRL+double-click

Compare two files:

select two files
press CTRL+D

Find in path: CTRL+MAJ+F

Search everywhere: SHIFT SHIFT

Vim

dd : delete current line
dd, p : move current line
yy, p : duplicate current line
i : switch to insert mode (before cursor)
Esc : exit insert mode
u : undo
~ : toggle case
/pattern : search for pattern
?pattern : search backward for pattern
n : repeat search in same direction
N : repeat search in opposite direction
:%s/old/new/g : replace all old with new throughout file
:%s/old/new/gc : replace all old with new throughout file with confirmations
:w : save
:q : quit (fails if there are unsaved changes)
:q! : quit and throw away unsaved changes
:wq : save and quit