FIXME remove later if not used.

ExecShell execute a shell command (like bash -c 'your command').

ExecShellf execute a shell command (like bash -c 'your command') but with format replacements.

ExecShellTimeout execute a shell command (like bash -c 'your command') with a timeout.

GetCmdOutput join stdout and stderr in a single string from Cmd.

Attention: this utility will handle a lot of memory and a lot of calls Be careful about anything you are going to store and always think about optimization.