"shell" in Makefile

Debian users,

In

http://git.kernel.org/?p=linux/kernel/git/linville/wireless-dev.git;a= summary

Vivek described a makefile containing this text.

obj-m := hello.o
KDIR := /lib/modules/$(shell uname -r)/build PWD := $(shell pwd)
default:

    $(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules

shell is not a command in the Etch here.

So what is "shell uname -r" and "shell pwd"? Why not just $(uname -r) and $(pwd)?

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Thanks, ... Peter E. Received on Sun Jun 24 12:58:36 2007