slow:Kernel#system returns true when the command exits with a zero exit status
slow:Kernel#system executes the specified command in a subprocess
slow:Kernel#system returns false when the command exits with a non-zero exit status
slow:Kernel#system expands shell variables when given a single string argument
slow:Kernel#system does not expand shell variables when given multiples arguments
slow:Kernel#system returns nil when command execution fails
slow:Kernel#system does not write to stderr when command execution fails
slow:Kernel#system executes with `sh` if the command contains shell characters
slow:Kernel#system ignores SHELL env var and always uses `sh`
