1.得到字符串长度
方法一:
$echo ${#variable}
code:
PHP 代码:
zhyfly: ~$ x="this is a test"
zhyfly: ~$ echo ${#x}
14
方法二:
$expr length "$variable"
code:
PHP 代码:
zhyfly: ~$ x="this is a test"
zhyfly: ~$ expr length "$x"
14
方法三:
$expr "$variable" : ".*"
code:
PHP 代码:
zhyfly: ~$ x="this is a test"
zhyfly: ~$ expr "$x" : ".*"
14
2.查找字符串子串位置
方法:
$expr index "$variable" "substring"
code:
PHP 代码:
zhyfly: ~$ x="this is a test"
zhyfly: ~$ expr index "$x" "is"
3
zhyfly: ~$ expr index "$x" "t"
1
(ps:如果出现重复,好象只能查到第一个,第二个,第三个,...,怎么查到呢???)
3.得到字符串子字符串
方法一:
$echo ${variable:position:length}
code:
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