Echo (computing)
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echo means several things in computing.
Terminal command
echo is a command in Unix (and by extension, its descendants, such as Linux) and MS-DOS that places a string on the terminal. It is typically used in shell scripts and batch programs to output status text to the screen or a file.
$ echo This is a test. This is a test. $ echo "This is a test." > ./test.txt $ cat ./test.txt This is a test.
Ping
echo refers to a ping request. See RFC 792 (ftp://ftp.rfc-editor.org/in-notes/rfc792.txt).
Server
An echo server is a standard service that runs on TCP port 7. Intended for testing purposes, it replies to all packets with a packet containing the same data. It is rarely used in practice.