转义符'\' 在“”中是作为普通字符还是特殊字符？

wang_songyan

＃echo "\m"
＃\m
这说明'\'是作为普通字符处理的
＃echo "\""
＃"
这说明'\'在“”中作为转义符使用将第二个"变为普通字符
那么'\'在""中到底是作为什么字符处理呢？

bjgirl

那要看他和哪个字符组合在一起啦

wang_songyan

那在echo "\t"中它是作为普通字符吧？

bjgirl

原帖由 "wang_songyan"]那在echo "\t"中它是作为普通字符吧？[/quote 发表：

man一下echo,看看这个\t是干嘛的
[quote]      \t     horizontal tab

ivhb

1. 
   
2. 慢慢看吧,应该很权威了
   
3. 
   
4. shell转义
   
5. 1, Each of the metacharacters listed above (See Definitions above) has a
   
6.         special meaning to the shell and causes termination of a word unless quoted.  
   
7. 2, A character can be quoted (i.e., made to stand for itself) by       
   
8.         preceding it with a \.  The pair \new-line is ignored.  
   
9. 3, All characters enclosed between a pair of single quote marks (''), are quoted.  A
   
10.         single quote cannot appear within single quotes.  
    
11. 4, Inside double quote marks (""), parameter and command substitution occurs and \ quotes
    
12. 
    
13. the
    
14.         characters \, `, ", and $. (vita remark 句号) $* and $@ have identical meanings when
    
15. 
    
16.         not quoted or when used as a parameter assignment value or as a file name. "$*"
    
17.         is equivalent to "$1d$2d...", where d is the first character of the IFS parameter,
    
18.          whereas "$@" is equivalent to "$1" "$2" ....             
    
19. 5, The special meaning of keywords or aliases can be removed by quoting
    
20.         any character of the keyword.  The recognition of function names or
    
21.         special command names listed below cannot be altered by quoting them
    
22. 
    

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haiyan_qi

要看\后面的哪个字符是否可被转义，若后面的字符可被转义，则 \ 被当作转义字符，否则不是转义字符。如 n 可被转义为换行符，因此当 \ 后面有个n时，\被用作转义，shell认为 " 也是可被转义的，因此当 \ 后面有个 " 时，\ 也被用作转义了

wang_songyan

明白了，感谢