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                ## 全局變量和局部變量,local 命令 Bash 函數體內直接聲明的變量,屬于全局變量,整個腳本都可以讀取。這一點需要特別小心。 ~~~ # 腳本 test.sh fn () { foo=1 echo "fn: foo = $foo" } fn echo "global: foo = $foo" ~~~ 上面腳本的運行結果如下。 ~~~ $ bash test.sh fn: foo = 1 global: foo = 1 ~~~ 上面例子中,變量`$foo`是在函數`fn`內部聲明的,函數體外也可以讀取。 函數體內不僅可以聲明全局變量,還可以修改全局變量。 ~~~ #! /bin/bash foo=1 fn () { foo=2 } fn echo $foo ~~~ 上面代碼執行后,輸出的變量`$foo`值為2。 函數里面可以用`local`命令聲明局部變量。 ~~~ #! /bin/bash # 腳本 test.sh fn () { local foo foo=1 echo "fn: foo = $foo" } fn echo "global: foo = $foo" ~~~ 上面腳本的運行結果如下。 ~~~ $ bash test.sh fn: foo = 1 global: foo = ~~~ 上面例子中,`local`命令聲明的`$foo`變量,只在函數體內有效,函數體外沒有定義
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