相关疑难解决方法(0)

$ ls -l /tmp/test/my\ dir/
total 0

我想知道为什么以下运行上述命令的方法失败或成功？

$ abc='ls -l "/tmp/test/my dir"'

$ $abc
ls: cannot access '"/tmp/test/my': No such file or directory
ls: cannot access 'dir"': No such file or directory

$ "$abc"
bash: ls -l "/tmp/test/my dir": No such file or directory

$ bash -c $abc
'my dir'

$ bash -c "$abc"
total 0

$ eval $abc
total 0

$ eval "$abc"
total 0