shell基礎

1、shell變量#定義變量 bianliang="abcd" #獲取變量 echo $bianliang echo ${bianliang} #變量長度 echo ${#bianliang} #查找變量中子字符串 echo `expr index "$bianliang" c` #拼接字符串 echo "this is a ${bianliang}" #提取子字符串 echo ${bianlia

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