Mac OS X Terminal shortcut keys

Terminal is one of the most frequently using application everyday but I have never had a chance to master its short keys. Today is a good day to start.

As I know, Terminal's short keys come from Emac, when I refer to meta short keys it means that you can use esc button or setting option(alt) button as a meta key. (Settings > Keyboard > Use option as meta key)

• Ctrl + a = Go to the beginning of the line
• Ctrl + e = Go to the end of the line
• Ctrl + l or Command + k = Clear screen
• Ctrl + r = Search for previous commands (pressing more r to get earlier commands)
• Ctrl + w = Delete the word before cursor
• Meta + d = Delete the word after the cursor
• Ctrl + u = Clear the line before cursor
• Ctrl + k = Clear the line after cursor
• Meta + t = Swap last 2 words before cursor
• Ctrl + d = Delete a character after cursor
• Meta + f = Move cursor to the right one word
• Meta + b = Move cursor to the left one word

Credit: Mac OS X keyboard shortcuts for terminal [closed], Command Line Keyboard Shortcuts for Mac OS X

Things I Didn't Know Rails Could Do

Something I thing it's easy and useful to me from James Edward Gray II presentation in RailsConf 2012
Ten Things You Didn't Know Rails Could Do

• rails c --sandbox
• rake db:migrate:status
• pluck
• User.pluck(:email)
• User.uniq.pluck(:email)
• Count Record in Group
• Model.group(:column).count
• File.atomic_write
• { nested: { a: 1 } }.deep_merge(nested: { b: 2 })
• hash.except(:key1, :key2)
• hash1.reverse_merge(hash2) # keep hash1 value if hash2 has a duplicate key
• content_tag_for(:tag, array) { |e| # content_inside }
• render partial: @active_record_model & to_partial_path
• grouped_options_for_select