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xcrun(1) [osx man page]

     xcrun -- run or locate development tools

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

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

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 11/24/2012 GIT-DIFFTOOL(1)
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