请问一下，下面的语句中<<- 是干什么的

run_mei

请问一下，下面的语句中<<-'RUBY' 是什么意思， <<- 是干什么的，我对shell不是太了解


"${TM_RUBY:-ruby}" -r"$TM_SUPPORT_PATH/lib/web_preview.rb" <<-'RUBY'
        puts html_head(
            :window_title    => ENV['WINDOW_TITLE'],
            :page_title        => ENV['PAGE_TITLE'],
            :sub_title        => ENV['SUB_TITLE']
        )
    RUBY

waker

1.    Here Documents
   
2.        This type of redirection instructs the shell to read  input  from  the
   
3.        current  source  until  a  line containing only word (with no trailing
   
4.        blanks) is seen.  All of the lines read up to that point are then used
   
5.        as the standard input for a command.
   
6. 
   
7.        The format of here-documents is:
   
8. 
   
9.               <<[-]word
   
10.                       here-document
    
11.               delimiter
    
12. 
    
13.        No parameter expansion, command substitution, arithmetic expansion, or
    
14.        pathname expansion is performed on word.  If any  characters  in  word
    
15.        are  quoted, the delimiter is the result of quote removal on word, and
    
16.        the lines in the here-document are not expanded.  If word is unquoted,
    
17.        all  lines  of the here-document are subjected to parameter expansion,
    
18.        command substitution, and arithmetic expansion.  In the  latter  case,
    
19.        the  character  sequence  \<newline> is ignored, and \ must be used to
    
20.        quote the characters \, $, and '.
    
21. 
    
22.        If the redirection operator is <<-, then all  leading  tab  characters
    
23.        are stripped from input lines and the line containing delimiter.  This
    
24.        allows here-documents within shell scripts to be indented in a natural
    
25.        fashion.
    
26. 
    

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blackold

LZ, man一下啊。

run_mei

谢谢，我在在windows上用cygwin，没有安装文档，google上又找不到，只好来这里问了

baijh

是重定向的