case语句的问题

wplxb

1. 
   
2. case "$1"
   
3.         in
   
4.                 [0-9]) echo 数字;;
   
5.                 [A-Z]) echo 大写字母;;
   
6.                 [a-z]) echo 小写字母;;
   
7.                 *) echo 特殊字符;;
   
8. esac
   

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我将上述代码保存为ctype
执行如下命令：

1. 
   
2. # ./ctype 2
   
3. 数字
   
4. # ./ctype a
   
5. 小写字母
   
6. # ./ctype b
   
7. 大写字母
   
8. # ./ctype A
   
9. 大写字母
   
10. # ./ctype :
    
11. 特殊字符
    

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为啥给的参数是一个小写字母时（a除外）echo的结果却是“大写字母”呢？

johnny_jiang

我也是，不知道

Yuri

你试试这个
[php]
# ./ctype a
# ./ctype a
# ./ctype a
# ./ctype a
# ./ctype a
# ./ctype a
# ./ctype a
# ./ctype b
# ./ctype b
# ./ctype b
# ./ctype b
[/php]
多试几次

Yuri

你试试这个
[php]
# ./ctype a
# ./ctype a
# ./ctype a
# ./ctype a
# ./ctype a
# ./ctype a
# ./ctype a
# ./ctype b
# ./ctype b
# ./ctype b
# ./ctype b
[/php]
多试几次

yongjian

Post by wplxb

1. 
   
2. case "$1"
   
3.         in
   
4.                 [0-9]) echo 数字;;
   
5.                 [A-Z]) echo 大写字母;;
   
6.                 [a-z]) echo 小写字母;;
   
7.                 *) echo 特殊字符;;
   
8. esac
   

复制代码

我将上述代码保存为ctype
执行如下命令：

1. 
   
2. # ./ctype 2
   
3. 数字
   
4. # ./ctype a
   
5. 小写字母
   
6. # ./ctype b
   
7. 大写字母
   
8. # ./ctype A
   
9. 大写字母
   
10. # ./ctype :
    
11. 特殊字符
    

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为啥给的参数是一个小写字母时（a除外）echo的结果却是“大写字母”呢？

run it with

1. 
   
2. LANG=C ./ctype b

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always good to use POSIX standard locale..

wplxb

Post by yongjian
run it with

1. 
   
2. LANG=C ./ctype b

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always good to use POSIX standard locale..

执行这个也一样的结果啊

yongjian

hmm... then I don't know. I ran it under posix std locale and it did change to normal.

johnny_jiang

1. 
   
2. case "$Keypress" in
   
3.   [[:lower:]]   ) echo "Lowercase letter";;
   
4.   [[:upper:]]   ) echo "Uppercase letter";;
   
5.   [0-9]            ) echo "Digit";;
   
6.   *                  ) echo "Punctuation, whitespace, or other";;
   
7. esac
   

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This is more portable. From abs

yongjian

good idea!

wplxb

Post by johnny_jiang

1. 
   
2. case "$Keypress" in
   
3.   [[:lower:]]   ) echo "Lowercase letter";;
   
4.   [[:upper:]]   ) echo "Uppercase letter";;
   
5.   [0-9]            ) echo "Digit";;
   
6.   *                  ) echo "Punctuation, whitespace, or other";;
   
7. esac
   

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This is more portable. From abs

谢谢johnny_jiang
另：From abs是什么意思？