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all:
    @for dir in $(DIRS); do make -C $$dir; done

I can't understand symbol @. Why use @ ?

nawfal
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Pengcheng
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    Possible duplicate: http://stackoverflow.com/questions/8610799/what-does-at-symbol-colon-mean-in-a-makefile – joaumg Jan 15 '16 at 02:10
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    Searching for `@` in the make manual would have been a good start too. – Etan Reisner Jan 15 '16 at 02:36
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    Possible duplicate of [Meaning of '@' in "@set -e" command in Makefiles](http://stackoverflow.com/questions/27400830/meaning-of-in-set-e-command-in-makefiles) – Virgile Jan 15 '16 at 07:52

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It just avoids echoing the command... Google is your friend

mauro
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