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2. echo (command) - Wikipedia

   en.wikipedia.org/wiki/Echo_(command)

   echo -n in Version 7 replaced prompt, (which behaved like echo but without terminating its output with a line delimiter). [17] On PWB/UNIX and later Unix System III, echo started expanding C escape sequences such as \n with the notable difference that octal escape sequences were expressed as \0ooo instead of \ooo in C. [18]

3. Echo (communications protocol) - Wikipedia

   en.wikipedia.org/wiki/Echo_(communications_protocol)

   Echo (one-to-all, one-to-one, or one-to-some distribution) is a group communications protocol where authenticated and encrypted information is addressed to members connected to a node. Adaptive Echo, Full Echo, and Half Echo can be chosen as several modes of the encrypted Echo protocol.

4. Echo sounding - Wikipedia

   en.wikipedia.org/wiki/Echo_sounding

   Echo sounding or depth sounding is the use of sonar for ranging, normally to determine the depth of water . It involves transmitting acoustic waves into water and recording the time interval between emission and return of a pulse; the resulting time of flight , along with knowledge of the speed of sound in water, allows determining the distance ...

5. Amazon Echo - Wikipedia

   en.wikipedia.org/wiki/Amazon_Echo

   The Echo Connect is a small adapter that plugs into any Echo and a home phone line, allowing the Echo to make voice calls through a home phone number. [ 91 ] In September 2018, Amazon announced the Echo Sub , a subwoofer that connects to other Echo speakers, and the Echo Wall Clock , which can display how much time is remaining on timers set ...

6. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

7. rc (Unix shell) - Wikipedia

   en.wikipedia.org/wiki/Rc_(Unix_shell)

   An rc session. rc (for "run commands") is the command line interpreter for Version 10 Unix and Plan 9 from Bell Labs operating systems.It resembles the Bourne shell, but its syntax is somewhat simpler.