make automatic variables

gistfile1.txt

$ make a/test.out
mkdir -p b
touch "b/test.dep1"
mkdir -p b
touch "b/test.dep2"
mkdir -p b
touch "b/test.dep3"
The file name of the target of the rule                                                                                       $@=a/test.out
The target member name, when the target is an archive member                                                                  $%=
The name of the first prerequisite                                                                                            $<=b/test.dep1
The names of all the prerequisites that are newer than the target, with spaces between them                                   $?=b/test.dep1 b/test.dep2
The names of all the prerequisites, with spaces between them                                                                  $^=b/test.dep1 b/test.dep2
This is like ‘$^’, but prerequisites listed more than once are duplicated in the order they were listed in the makefile       $+=b/test.dep1 b/test.dep2 b/test.dep2
The names of all the order-only prerequisites, with spaces between them                                                       $|=b/test.dep3
The stem with which an implicit rule matches                                                                                  $*=test
The directory part of the file name of the target, with the trailing slash removed                                            $(@D)=a
The file-within-directory part of the file name of the target                                                                 $(@F)=test.out
The directory part and the file-within-directory part of the stem                                                             $(*D)=.
The directory part and the file-within-directory part of the stem                                                             $(*F)=test
The directory part and the file-within-directory part of the target archive member name                                       $(%D)=
The directory part and the file-within-directory part of the target archive member name                                       $(%F)=
The directory part and the file-within-directory part of the first prerequisite                                               $(<D)=b
The directory part and the file-within-directory part of the first prerequisite                                               $(<F)=test.dep1
Lists of the directory parts of all prerequisites                                                                             $(^D)=b b
Lists of the file-within-directory parts of all prerequisites                                                                 $(^F)=test.dep1 test.dep2
Lists of the directory parts of all prerequisites, including multiple instances of duplicated prerequisites                   $(+D)=b b b
Lists of the the file-within-directory parts of all prerequisites, including multiple instances of duplicated prerequisites   $(+F)=test.dep1 test.dep2 test.dep2
Lists of the directory parts of all prerequisites that are newer than the target                                              $(?D)=b b
Lists of the file-within-directory parts of all prerequisites that are newer than the target                                  $(?F)=test.dep1 test.dep2
rm b/test.dep1 b/test.dep3

Makefile

# https://www.gnu.org/software/make/manual/html_node/Automatic-Variables.html

b/%.dep1:
	mkdir -p b
	touch "$@"

b/%.dep2:
	mkdir -p b
	touch "$@"

b/%.dep3:
	mkdir -p b
	touch "$@"

a/%.out: b/%.dep1 b/%.dep2 b/%.dep2 | b/%.dep3
	@echo "The file name of the target of the rule                                                                                       \$$@=$@"
	@echo "The target member name, when the target is an archive member                                                                  \$$%=$%"
	@echo "The name of the first prerequisite                                                                                            \$$<=$<"
	@echo "The names of all the prerequisites that are newer than the target, with spaces between them                                   \$$?=$?"
	@echo "The names of all the prerequisites, with spaces between them                                                                  \$$^=$^"
	@echo "This is like ‘$$^’, but prerequisites listed more than once are duplicated in the order they were listed in the makefile       \$$+=$+"
	@echo "The names of all the order-only prerequisites, with spaces between them                                                       \$$|=$|"
	@echo "The stem with which an implicit rule matches                                                                                  \$$*=$*"
	@echo "The directory part of the file name of the target, with the trailing slash removed                                            \$$(@D)=$(@D)"
	@echo "The file-within-directory part of the file name of the target                                                                 \$$(@F)=$(@F)"
	@echo "The directory part and the file-within-directory part of the stem                                                             \$$(*D)=$(*D)"
	@echo "The directory part and the file-within-directory part of the stem                                                             \$$(*F)=$(*F)"
	@echo "The directory part and the file-within-directory part of the target archive member name                                       \$$(%D)=$(%D)"
	@echo "The directory part and the file-within-directory part of the target archive member name                                       \$$(%F)=$(%F)"
	@echo "The directory part and the file-within-directory part of the first prerequisite                                               \$$(<D)=$(<D)"
	@echo "The directory part and the file-within-directory part of the first prerequisite                                               \$$(<F)=$(<F)"
	@echo "Lists of the directory parts of all prerequisites                                                                             \$$(^D)=$(^D)"
	@echo "Lists of the file-within-directory parts of all prerequisites                                                                 \$$(^F)=$(^F)"
	@echo "Lists of the directory parts of all prerequisites, including multiple instances of duplicated prerequisites                   \$$(+D)=$(+D)"
	@echo "Lists of the the file-within-directory parts of all prerequisites, including multiple instances of duplicated prerequisites   \$$(+F)=$(+F)"
	@echo "Lists of the directory parts of all prerequisites that are newer than the target                                              \$$(?D)=$(?D)"
	@echo "Lists of the file-within-directory parts of all prerequisites that are newer than the target                                  \$$(?F)=$(?F)"