xcrun(1) [osx man page]

xcrun
     xcrun -- run or locate development tools

SYNOPSIS

     xcrun [-sdk SDK] -find <tool_name>

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

     <tool_name> [<tool_arguments>]

DESCRIPTION

     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).

USAGE

     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.

OPTIONS

     -verbose
	   display information about how the redirected path is constructed.

     -no-cache
	   don't consult the cache when looking up values.  In effect, causes the cache to be refreshed.

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

     -log  print the full command line that is invoked.

     -find
	   print the full path to the tool.

ENVIRONMENT

     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

DIAGNOSTICS

     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 variables instead.

SEE ALSO

     xcodebuild -find Xcode coexistence

GIT-DIFFTOOL(1) 						    Git Manual							   GIT-DIFFTOOL(1)

NAME

       git-difftool - Show changes using common diff tools

SYNOPSIS

       git difftool [<options>] [<commit> [<commit>]] [--] [<path>...]

DESCRIPTION

       git difftool is a git command that allows you to compare and edit files between revisions using common diff tools. git difftool is a
       frontend to git diff and accepts the same options and arguments. See git-diff(1).

OPTIONS

       -y, --no-prompt
	   Do not prompt before launching a diff tool.

       --prompt
	   Prompt before each invocation of the diff tool. This is the default behaviour; the option is provided to override any configuration
	   settings.

       -t <tool>, --tool=<tool>
	   Use the diff tool specified by <tool>. Valid diff tools are: araxis, bc3, deltawalker, diffuse, emerge, ecmerge, gvimdiff, kdiff3,
	   kompare, meld, opendiff, p4merge, tkdiff, vimdiff and xxdiff.

	   If a diff tool is not specified, git difftool will use the configuration variable diff.tool. If the configuration variable diff.tool is
	   not set, git difftool will pick a suitable default.

	   You can explicitly provide a full path to the tool by setting the configuration variable difftool.<tool>.path. For example, you can
	   configure the absolute path to kdiff3 by setting difftool.kdiff3.path. Otherwise, git difftool assumes the tool is available in PATH.

	   Instead of running one of the known diff tools, git difftool can be customized to run an alternative program by specifying the command
	   line to invoke in a configuration variable difftool.<tool>.cmd.

	   When git difftool is invoked with this tool (either through the -t or --tool option or the diff.tool configuration variable) the
	   configured command line will be invoked with the following variables available: $LOCAL is set to the name of the temporary file
	   containing the contents of the diff pre-image and $REMOTE is set to the name of the temporary file containing the contents of the diff
	   post-image.	$MERGED is the name of the file which is being compared.  $BASE is provided for compatibility with custom merge tool
	   commands and has the same value as $MERGED.

       -x <command>, --extcmd=<command>
	   Specify a custom command for viewing diffs.	git-difftool ignores the configured defaults and runs $command $LOCAL $REMOTE when this
	   option is specified. Additionally, $BASE is set in the environment.

       -g, --gui
	   When git-difftool is invoked with the -g or --gui option the default diff tool will be read from the configured diff.guitool variable
	   instead of diff.tool.

       See git-diff(1) for the full list of supported options.

CONFIG VARIABLES

       git difftool falls back to git mergetool config variables when the difftool equivalents have not been defined.

       diff.tool
	   The default diff tool to use.

       diff.guitool
	   The default diff tool to use when --gui is specified.

       difftool.<tool>.path
	   Override the path for the given tool. This is useful in case your tool is not in the PATH.

       difftool.<tool>.cmd
	   Specify the command to invoke the specified diff tool.

	   See the --tool=<tool> option above for more details.

       difftool.prompt
	   Prompt before each invocation of the diff tool.

SEE ALSO

       git-diff(1)
	   Show changes between commits, commit and working tree, etc

       git-mergetool(1)
	   Run merge conflict resolution tools to resolve merge conflicts

       git-config(1)
	   Get and set repository or global options

GIT

       Part of the git(1) suite

Git 1.7.10.4							    11/24/2012							   GIT-DIFFTOOL(1)