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i searched for a while, but cannot find the reference of that syntax. |
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thanks a lot. |
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|
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On Thu, Sep 17, 2009 at 12:27 AM, Frank Peters <frank.peters@×××××××.net> wrote: |
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> On Wed, 16 Sep 2009 21:36:37 +0800 |
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> Xi Shen <davidshen84@××××××××××.com> wrote: |
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> |
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>> when reading that doc, i cannot understand the following script |
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>> |
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>> #!/bin/bash |
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>> exec /usr/lib/distcc/bin/sparc-unknown-linux-gnu-g${0:$[-2]} "$@" |
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>> |
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>> what does the ":" do here? |
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>> |
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>> |
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> |
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> The construction "${0:$[-2]}" will return the last two characters of |
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> the $0 string, with the $0 string being the name of the called script. |
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> These last two characters are appended to the string "sparc-unknown-linux-gnu-g". |
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> |
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> After glancing at the section in cross-compiling-distcc.xml, it seems |
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> that this particular script will be called via a symlink, which will |
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> be one of gcc, g++, c++. The last two chars of the link name are thus |
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> appended to "sparc-unknown-linux-gnu-g" to form the name of an execuatable, |
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> e.g. /usr/lib/distcc/bin/sparc-unknown-linux-gnu-gcc. |
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> |
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> Frank Peters |
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> |
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> |
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> |
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-- |
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Best Regards, |
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David Shen |
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|
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http://twitter.com/davidshen84/ |
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http://meme.yahoo.com/davidshen84/ |
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