gmake commands

The following example prints (echoes) the command being executed:

target : prerequisite_1 prerequisite_2
	command foo bar

The following example does not print (by the power of the @) the command being executed:

target : prerequisite_1 prerequisite_2
	@command foo bar

See also the special target .SILENT, the -s option and the -n option.

make stops if there is an error executing a command (meaning a command's exit status being non zero). If it is desired to continue processing even if the command returns zero, the command nees be prepended by a hyphen:

target : prerequisite_1 prerequisite_2
	-command foo bar

See also the -i option.

SHELL is the environment variable whose value is used to execute a shell in which the commands are executed. On windows, if SHELL is not defined, the value of COMSPEC is used.