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Appendix A: Quick Reference 169
$(file op filename,text)
Expand the arguments, then open the file filename using mode op and write
text to that file.
See Section 8.6 [The file Function], page 91.
$(value var)
Evaluates to the contents of the variable var, with no expansion performed on
it.
See Section 8.8 [The value Function], page 93.
Here is a summary of the automatic variables. See Section 10.5.3 [Automatic Variables],
page 120, for full information.
$@ The file name of the target.
$% The target member name, when the target is an archive member.
$< The name of the first prerequisite.
$? The names of all the prerequisites that are newer than the target, with spaces
between them. For prerequisites which are archive members, only the named
member is used (see Chapter 11 [Archives], page 129).
$^
$+ The names of all the prerequisites, with spaces between them. For prerequisites
which are archive members, only the named member is used (see Chapter 11
[Archives], page 129). The value of $^ omits duplicate prerequisites, while $+
retains them and preserves their order.
$* The stem with which an implicit rule matches (see Section 10.5.4 [How Patterns
Match], page 122).
$(@D)
$(@F) The directory part and the file-within-directory part of $@.
$(*D)
$(*F) The directory part and the file-within-directory part of $*.
$(%D)
$(%F) The directory part and the file-within-directory part of $%.
$(<D)
$(<F) The directory part and the file-within-directory part of $<.
$(^D)
$(^F) The directory part and the file-within-directory part of $^.
$(+D)
$(+F) The directory part and the file-within-directory part of $+.
$(?D)
$(?F) The directory part and the file-within-directory part of $?.
These variables are used specially by GNU make:
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