理解shell的eval命令

看如下两条命令： [zhangsan@XEN /sys]$ a="ls";b="\$a";c="$b";"$c" Hey! No command '$a' found, did you mean 'ia'?html [zhangsan@XEN /sys]$ a="ls";b="\$a";c="$b";eval "$c" block bus class dev devices firmware fs

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