Useful keys for - Console, Tmux

CONSOLE Cmd Action a on the beginning u delete all line w delete previous word xx select line i insert tab e edit line h like backspace j like enter k delete to the end l clear screen and live line comnand b move right f move left r search in history

TMUX tmux new -s session-name tmux attach-session -t shared-session Ctrl+b+: Cmd Action w List window s List sessions c Create a new window x Close widnow n Change to next window p Change to previous window " Split pane horizontally % Split pane vertically , Rename current window o Move to next pane d Deatach session [ Start read mod

Array

var = Array(1) # => [1]
var = *1       # => [1]

# * is the same as Array

var = Array([1,2,3]) #=> [1,2,3]
var = *[1,2,3]       #=> [1,2,3]

# its useful when we need array like
var = [var] unless var.is_a? Array
var = [var].flatten

# we can write
var = *var     # => [var]
# but can't
*var           # => syntax error