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OSX 10.6.2 - man page for xcrun (osx section 1)

     xcrun -- run or locate development tools

     xcrun [-sdk SDK] -find <tool_name>

     xcrun [-sdk SDK] [-log] <tool_name> [<tool_arguments>]

     <tool_name> [<tool_arguments>]

     xcrun provides a means locate or invoke coexistence- and platform-aware developer tools from
     the command-line, without requiring users to modify makefiles or otherwise take laborious or
     inconvenient measures to adopt Xcode's multiple tool chains.

     xcode-select is used to specify which installation of Xcode is used, and may be overridden
     by the DEVELOPER_DIR environment variable.

     The SDK defaults to the current OS SDK, and can be specified by SDKROOT environment variable
     or the -sdk flag (which takes precedences over SDKROOT).

     The first usage returns the full path to the found tool_name.

     The second usage executes tool_name with the given tool_arguments.

     The last syntax is when xcrun replaces any of the standard UNIX developer tools (typically
     in /usr/bin).  In this case, xcrun will use its tool name to locate the corresponding tool
     within evaluated DEVELOPER_DIR and SDK.

     If the tool is not named xcrun , tool_arguments are not parsed by xcrun.

	   display information about how the redirected path is constructed.

	   don't consult the cache when looking up values.  In effect, causes the cache to be

     -sdk SDK
	   specifies which SDK to use.	Overrides any SDKROOT set in the environment.

     -log  print the full command line that is invoked.

	   print the full path to the tool.

     DEVELOPER_DIR - specifies the search path for locating the current developer tools
     (overrides xcode-select default).

     SDKROOT - specifies the SDK to use; overriden by the command line -sdk flag.

     xcrun_log - same as specifying -log

     xcrun_nocache - same as specifying -no-cache

     xcrun_verbose - same as specifying -verbose

     When xcrun is invoked with the name xcrun , the flags -log and -verbose are useful debugging
     aids.  The flag -no-cache can be used to bypass cache lookup.

     When xcrun as taken the place of another tool, the arguments are those of the tool replaced,
     and the various xcrun flags can't be used.  In this case, use the specific environment vari-
     ables instead.

     xcodebuild -find Xcode coexistence

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