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Writing
the commands in rules
The
commands of a rule consist of shell command lines to be executed one by
one. Each command line must start with a tab, except that the first command
line may be attached to the target-and-dependencies line with a semicolon
in between. Blank lines and lines of just comments may appear among the
command lines; they are ignored. (But beware, an apparently blank line
that begins with a tab is not blank! It is an empty command.)
Users use many different
shell programs, but commands in make-files are always interpreted by /bin/sh
unless the makefile specifies otherwise.
The shell that is in use
determines whether comments can be written on command lines, and what syntax
they use. When the shell is /bin/sh,
a #
starts a comment that extends to the end of the line. The #
does not have to be at the beginning of a line. Text on a line before a
#
is not part of the comment.
See the following documentation
for more discussion.
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