指令大全 - Linux 指令篇:字串处理--expr
Linux 指令篇:字串处理--expr
2004-04-23 15:18 pm来自:Linux文档
现载:Www.8s8s.coM
地址:无名
名称:expr
### 字串长度
shell>> expr length "this is a test"
14
### 数字商数
shell>> expr 14 % 9
5
### 从位置处抓取字串
shell>> expr substr "this is a test" 3 5
is is
### 数字串 only the first character
shell>> expr index "testforthegame" e
2
### 字串真实重现
shell>> expr quote thisisatestformela
thisisatestformela