(make.info.gz) Commands

 
 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-prerequisites 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;  Empty Commands.)
 
    Users use many different shell programs, but commands in makefiles
 are always interpreted by `/bin/sh' unless the makefile specifies
 otherwise.   Command Execution Execution.
 
    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.

 
* Echoing                     How to control when commands are echoed.
* Execution                   How commands are executed.
* Parallel                    How commands can be executed in parallel.
* Errors                      What happens after a command execution error.
* Interrupts                  What happens when a command is interrupted.
* Recursion                   Invoking `make' from makefiles.
* Sequences                   Defining canned sequences of commands.
* Empty Commands              Defining useful, do-nothing commands.

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