What does “@” mean in makefile?

Question

We offen use @echo \"do...\" to letting to print only do.... But who can tell me what is the mean of this condition ?

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Answer 1

It will hide the output of the commandline when executing. Normally each command, when executing a rule, is printed to the console. This will suppress this output.

Answer 2

It disables printing the command line being executed. Any output from the command itself still appears. See this previous question or see this Makefile reference.