Re: ~/.bashrc problem

From: Olive (olive.lin_at_versateladsl.be)
Date: 04/15/05

  • Next message: Jon Dowland: "Re: file cp" 
    Date: Fri, 15 Apr 2005 15:33:53 +0200
To: debian-user@lists.debian.org

    Kuang He wrote:
    > 2005/4/15, Robert Vangel <robert@vangelr.net.au>:
    >
    >>Using " should work, or if you want a literal " you would use \" but
    >>this would break it...
    >
    >
    > Using " works most of the time, but, if you encouter some URL like
    > http://bbs.ustc.edu.cn/cgi/sf?bid=260&aof=M425dea7e&fn=23.jpg
    > It does not work properly.

    The fact is that you must convice bash to pass the url to wget without
    modification.

    Let's see a few examples

    [oesser@logic-pc1 ~]$ a="hello"
    [oesser@logic-pc1 ~]$ echo "$a"
    hello

    However the expansion is done only once; characters inside the variable
    a itself is not expanded anymore:

    [oesser@logic-pc1 ~]$ hello="good morning"
    [oesser@logic-pc1 ~]$ a='$hello' # character inside single quote are
                                          # not expanded
    [oesser@logic-pc1 ~]$ echo "$a" # expand the variable $a but once
                                          # it is done do not try to expands
                                          # the variable $hello
    $hello

    So if you use "$1" it will work whatever characters are present in $1.
    But if you use a URL directly written on the command line, not stored in
    a variable; you must enclose it in single quote to prevent expansion of
    "variables" which might be present in the URL.

    Olive 

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