shell中=和～的用法

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#!/bin/bash
apath=$1;acontent=$2;aexp=$3;

if [[ $aexp =~ all ]] ;then                                                                                                                                                        
    atype=''
else
    atype=".$aexp"
fi

find $apath  -name  "*"$atype -type f -print0 | xargs -0 grep --color -rn "$acontent"