heyyou=homeecho “$heyyou” # We get home `command` 倒引号 (backticks) 在前面的单双引号，括住的是字串，但如果该字串是一列命令列，会怎样？答案是不会执行。
双语例句
1
Whenever I can, I write shell scripts as Ruby scripts with lots of backticks.
我当时能做的就只能写那种满是倒引号(backticks)的shell脚本来作为Ruby脚本。
2
Particular care should be taken with this approach (and any approach that uses the system() function, backticks, or any user-provided input to do file operations).