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Update shell.md #25

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9 changes: 5 additions & 4 deletions shell.md
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Original file line number Diff line number Diff line change
Expand Up @@ -190,7 +190,7 @@ shell只定义了一个非常简单的编程语言，所以，如果你的脚本
以“#”开头的行就是注释，会被解释器忽略。

### 多行注释
sh里没有多行注释，只能每一行加一个#号。就像这样：
sh里没有多行注释，只能每一行加一个#号，就像这样：

#--------------------------------------------
# 这是一个自动打ipa的脚本，基于webfrogs的ipa-build书写：https://github.com/webfrogs/xcode_shell/blob/master/ipa-build
Expand Down Expand Up @@ -227,14 +227,15 @@ sh里没有多行注释，只能每一行加一个#号。就像这样：
str="Hello, I know your are \"$your_name\"! \n"

- 双引号里可以有变量
- 双引号里可以出现转义字符
- 双引号里可以出现转义字符（比如 \"）
- echo 命令默认不执行转义控制字符，需要加 -e 参数才行，比如把上例的 \n 执行成换行

### 字符串操作
#### 拼接字符串

your_name="qinjx"
greeting="hello, "$your_name" !"
greeting_1="hello, ${your_name} !"
greeting="hello, "$your_name"! "
greeting_1="hello, ${your_name}! "

echo $greeting $greeting_1

Expand Down