Here are some of the useful Shortcuts For Messaging App:
Control+Command+ A/ I /O/W
Set your status as available (A), invisible (I), away (W), or offline (O ).Command + 1
Show buddies listControl+Tab
Move between conversations listed on the left of the Messages window (if two or more conversations are listed).Option+ Up/Down
Cycle through things you’ve already typed and sent —useful if you need to repeat something said earlier in the conversation. Hit Return to resend the message.
Option+Command+B
Show the entry within Contacts of the person you’re chatting to; if they have no entry within your address book, you’ll instantly create a new one.
Shift+Command+I
Show profile details of the person you’re chatting to, and set audio alerts/bounce the Messages icon
in the Dock/run an AppleScript when they perform various actions, such as come online or send you a message.
Option+Command+ E
Compose a new email to the individual in Mail, provided an email address is associated with the individual’s IM chat account.
Option+Command+ L
Show a list of recent and ongoing file transfers (to transfer a file, drag and drop it onto the conversation within the Messages window, or hit Option+Command+ F to open a dialog box where you can select a file).
Shift+Command+ K
Add a timestamp to the conversation, similar to that which appears when you initially go online
and start chatting with somebody—useful if you want to record when something was said
Option+Command+ K
Permanently delete conversation—cannot be undone.
Shift+Command+ E
Open video effects window so you can apply special effects to any video conversation (click the camera
icon at the top right of the chat window to start video conversation; note that Messages doesn’t support video calls on all chat protocols).
