dereference.sh

BASH Shell 编程 经典教程 《高级SHELL脚本编程》中文版

#!/bin/bash
# dereference.sh
# 对一个传递给函数的参数进行解除引用的操作. 
# 此脚本由Bruce W. Clare所编写. 

dereference ()
{
     y=\$"$1"   # 变量名. 
     echo $y    # $Junk

     x=`eval "expr \"$y\" "`
     echo $1=$x
     eval "$1=\"Some Different Text \""  # 赋新值. 
}

Junk="Some Text"
echo $Junk "before"    # Some Text before

dereference Junk
echo $Junk "after"     # Some Different Text after

exit 0