鉴于我有一个 bash 脚本
ev=USER
如何使用 ev 获取 $USER 的环境变量值？
尝试天真地做：
echo ${"$"$ev}
这导致糟糕的替代。
我希望能取回 $USER 的任何价值。
每当我尝试通过运行时growisofs，sudo我总是收到以下错误消息。
$ sudo -i growisofs
:-( growisofs is being executed under sudo, aborting!
See NOTES paragraph in growisofs manual page for further details.
$ sudo -s growisofs
:-( growisofs is being executed under sudo, aborting!
See NOTES paragraph in growisofs manual page for further details.
这导致我不得不做一个sudo su -跟着growisofs.
$ sudo su - -c growisofs
growisofs: previous "session" device is not specified, do use -M or -Z option
-or-
$ sudo su - …