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5.1 Command Echoing

Normally make prints each command line before it is executed. We call this echoing because it gives the appearance that you are typing the commands yourself.

When a line starts with `@', the echoing of that line is suppressed. The `@' is discarded before the command is passed to the shell. Typically you would use this for a command whose only effect is to print something, such as an echo command to indicate progress through the makefile:

 
@echo About to make distribution files

When make is given the flag `-n' or `--just-print' it only echoes commands, it won't execute them. See section Summary of Options. In this case and only this case, even the commands starting with `@' are printed. This flag is useful for finding out which commands make thinks are necessary without actually doing them.

The `-s' or `--silent' flag to make prevents all echoing, as if all commands started with `@'. A rule in the makefile for the special target .SILENT without prerequisites has the same effect (see section Special Built-in Target Names). .SILENT is essentially obsolete since `@' is more flexible.



 
 
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