code: function({options}, succeed, skip) {
      return each(options.if_exec).call((cmd, next) => {
        this.log({
          message: `Nikita \`if_exec\`: ${cmd}`,
          level: 'DEBUG',
          module: 'nikita/misc/conditions'
        });
        return this.system.execute({
          cmd: cmd,
          relax: true,
          stderr_log: false,
          stdin_log: false,
          stdout_log: false
        }, function(err, {code}) {
          this.log({
            message: `Nikita \`if_exec\`: code is "${code}"`,
            level: 'INFO',
            module: 'nikita/misc/conditions'
          });
          if (code === 0) {
            return next();
          } else {
            return skip();
          }
        });
      }).next(succeed);
    }
docs: The callback `succeed` is called if all the provided command were executed successfully otherwise the callback `skip` is called.