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