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5.1.4 Echo
If the Echo option is on, then the system echoes every command at the top level. When logging a CoCoA session, one would set Echo to TRUE in order to log both the input as well as the output in a CoCoA session (see OpenLog).

Example
1+1;
2
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Set Echo;
1+1;
1 + 1
2
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L := [1,2,3];
L := [1, 2, 3]
Unset Echo;
SET(Echo, FALSE)
L := [4,5,6];
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