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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
@echo About to make distribution files
When `make' is given the flag `-n' or `--just-print', echoing is all
that happens, no execution. Note: 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' has the same effect (Note: Special Built-in Target
Names.). `.SILENT' is essentially obsolete since `@'
is more flexible.
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