programs/system_with_environment.rb

tests/_examples/programs/system_with_environment.rb in the metorex repository.

# A Hash before the command names what the child's environment adds, or takes
# away where a name is given nil, and leaves the parent's own alone.
$stdout.sync = true
ENV["KEPT"] = "parent"
p(system({ "ADDED" => "child" }, "sh", "-c", 'echo "$ADDED $KEPT"'))
p(system({ "KEPT" => nil }, "sh", "-c", 'echo "[$KEPT]"'))
p(system({ "ADDED" => "shell" }, 'echo "$ADDED"'))
p(system(["sh", "named"], "-c", 'echo $0'))
p(system({ "CODE" => "4" }, 'exit $CODE'))
p($?.exitstatus)
p(ENV["ADDED"])

Output:

child parent
true
[]
true
shell
true
named
true
false
4
nil