XCode
从 App store 或苹果开发者网站安装 Xcode 。
紧接着，安装 Xcode command line tools，运行：
xcode-select --install运行命令后，按照指引，你将完成 Xcode command line tools 安装。
注:
如果你不是一名 iOS 或 OS X 开发者，可以跳过安装 XCode 的过程，直接安装 Xcode command line tools 。安装完成后，你将可以直接在 terminal 中使用主要的命令，比如：make, GCC, clang, perl, svn, git, size, strip, strings, libtool, cpp 等等。
如果你想了解 Xcode command line tools 包含多少可用的命令，可以到 /Library/Developer/CommandLineTools/usr/bin 查看。以下为其中的命令列表：
$ ls -la
total 216632
drwxr-xr-x 116 root admin 3712 Nov 13 12:35 .
drwxr-xr-x 7 root admin 224 Oct 20 09:19 ..
-rwxr-xr-x 1 root admin 22816 Oct 20 09:24 BuildStrings
-rwxr-xr-x 1 root admin 29312 Oct 20 09:24 CpMac
-rwxr-xr-x 1 root admin 105488 Oct 20 09:24 DeRez
-rwxr-xr-x 1 root admin 18512 Oct 20 09:23 GetFileInfo
-rwxr-xr-x 1 root admin 62960 Oct 20 09:24 MergePef
-rwxr-xr-x 1 root admin 23008 Oct 20 09:23 MvMac
-rwxr-xr-x 1 root admin 24432 Oct 20 09:23 ResMerger
-rwxr-xr-x 1 root admin 111408 Oct 20 09:24 Rez
-rwxr-xr-x 1 root admin 40400 Oct 20 09:24 RezDet
-rwxr-xr-x 1 root admin 22864 Oct 20 09:24 RezWack
-rwxr-xr-x 1 root admin 22896 Oct 20 09:23 SetFile
-rwxr-xr-x 1 root admin 23760 Oct 20 09:24 SplitForks
-rwxr-xr-x 1 root admin 22832 Oct 20 09:24 UnRezWack
-rwxr-xr-x 1 root admin 33920 Oct 20 09:23 ar
-rwxr-xr-x 1 root admin 28000 Oct 20 09:24 as
-rwxr-xr-x 1 root admin 18176 Oct 20 09:24 asa
-rwxr-xr-x 1 root admin 212208 Oct 20 09:24 bison
-rwxr-xr-x 1 root admin 150048 Oct 20 09:23 bitcode_strip
lrwxr-xr-x 1 root admin 5 Nov 13 12:35 c++ -> clang
-rwxr-xr-x 1 root admin 23152 Oct 20 09:23 c89
-rwxr-xr-x 1 root admin 23248 Oct 20 09:24 c99
lrwxr-xr-x 1 root admin 5 Nov 13 12:35 cc -> clang
-rwxr-xr-x 1 root admin 78335840 Oct 20 09:24 clang
lrwxr-xr-x 1 root admin 5 Nov 13 12:35 clang++ -> clang
-rwxr-xr-x 1 root admin 120064 Oct 20 09:23 cmpdylib
-rwxr-xr-x 1 root admin 145872 Oct 20 09:24 codesign_allocate
lrwxr-xr-x 1 root admin 17 Nov 13 12:35 codesign_allocate-p -> codesign_allocate
-rwxr-xr-x 1 root admin 3344 Sep 26 06:40 cpp
-rwxr-xr-x 1 root admin 27712 Oct 20 09:24 ctags
-rwxr-xr-x 1 root admin 145824 Oct 20 09:24 ctf_insert
lrwxr-xr-x 1 root admin 13 Nov 13 12:35 dsymutil -> llvm-dsymutil
-rwxr-xr-x 1 root admin 1006032 Oct 20 09:23 dwarfdump
-rwxr-xr-x 1 root admin 193040 Oct 20 09:24 dyldinfo
-rwxr-xr-x 1 root admin 569056 Oct 20 09:23 flex
-rwxr-xr-x 1 root admin 569056 Oct 20 09:24 flex++
lrwxr-xr-x 1 root admin 3 Nov 13 12:35 g++ -> gcc
-rwxr-xr-x 1 root admin 103188 Sep 26 09:01 gatherheaderdoc
-rwxr-xr-x 1 root admin 18672 Oct 20 09:23 gcc
lrwxr-xr-x 1 root admin 8 Nov 13 12:35 gcov -> llvm-cov
-rwxr-xr-x 1 root admin 2128288 Oct 20 09:24 git
lrwxr-xr-x 1 root admin 3 Nov 13 12:35 git-receive-pack -> git
-rwxr-xr-x 1 root admin 1196640 Oct 20 09:24 git-shell
lrwxr-xr-x 1 root admin 3 Nov 13 12:35 git-upload-archive -> git
-rwxr-xr-x 1 root admin 1206048 Oct 20 09:24 git-upload-pack
-rwxr-xr-x 1 root admin 142336 Oct 20 09:24 gm4
-rwxr-xr-x 1 root admin 165152 Oct 20 09:24 gnumake
-rwxr-xr-x 1 root admin 90960 Oct 20 09:24 gperf
-rwxr-xr-x 1 root admin 24384 Oct 20 09:24 hdxml2manxml
-rwxr-xr-x 1 root admin 162025 Sep 26 09:01 headerdoc2html
-rwxr-xr-x 1 root admin 65520 Oct 20 09:24 indent
-rwxr-xr-x 1 root admin 136784 Oct 20 09:24 install_name_tool
-rwxr-xr-x 1 root admin 2165904 Oct 20 09:23 ld
-rwxr-xr-x 1 root admin 230 Sep 26 08:51 lex
-rwxr-xr-x 1 root admin 154592 Oct 20 09:24 libtool
-rwxr-xr-x 1 root admin 66000 Oct 20 09:24 lipo
-rwxr-xr-x 1 root admin 67840 Oct 20 09:24 lldb
-rwxr-xr-x 1 root admin 3305040 Oct 20 09:24 llvm-cov
-rwxr-xr-x 1 root admin 29665296 Oct 20 09:24 llvm-dsymutil
-rwxr-xr-x 1 root admin 10548768 Oct 20 09:24 llvm-nm
-rwxr-xr-x 1 root admin 11871088 Oct 20 09:23 llvm-objdump
-rwxr-xr-x 1 root admin 32672 Oct 20 09:24 llvm-otool
-rwxr-xr-x 1 root admin 1264256 Oct 20 09:24 llvm-profdata
-rwxr-xr-x 1 root admin 2857264 Oct 20 09:24 llvm-size
-rwxr-xr-x 1 root admin 3567 Sep 26 08:55 lorder
-rwxr-xr-x 1 root admin 142336 Oct 20 09:24 m4
-rwxr-xr-x 1 root admin 165152 Oct 20 09:24 make
-rwxr-xr-x 1 root admin 7604 Sep 26 08:54 mig
lrwxr-xr-x 1 root admin 7 Nov 13 12:35 nm -> llvm-nm
-rwxr-xr-x 1 root admin 132896 Oct 20 09:24 nm-classic
-rwxr-xr-x 1 root admin 162720 Oct 20 09:23 nmedit
lrwxr-xr-x 1 root admin 12 Nov 13 12:35 objdump -> llvm-objdump
lrwxr-xr-x 1 root admin 10 Nov 13 12:35 otool -> llvm-otool
-rwxr-xr-x 1 root admin 648720 Oct 20 09:24 otool-classic
-rwxr-xr-x 1 root admin 132784 Oct 20 09:24 pagestuff
-rwxr-xr-x 1 root admin 23344 Oct 20 09:23 projectInfo
lrwxr-xr-x 1 root admin 7 Nov 13 12:35 ranlib -> libtool
-rwxr-xr-x 1 root admin 59328 Oct 20 09:23 rebase
-rwxr-xr-x 1 root admin 204960 Oct 20 09:24 redo_prebinding
-rwxr-xr-x 1 root admin 62464 Oct 20 09:23 resolveLinks
-rwxr-xr-x 1 root admin 73664 Oct 20 09:24 rpcgen
-rwxr-xr-x 1 root admin 48864 Oct 20 09:23 segedit
lrwxr-xr-x 1 root admin 9 Nov 13 12:35 size -> llvm-size
-rwxr-xr-x 1 root admin 120080 Oct 20 09:23 size-classic
-rwxr-xr-x 1 root admin 130816 Oct 20 09:24 stapler
-rwxr-xr-x 1 root admin 120400 Oct 20 09:23 strings
-rwxr-xr-x 1 root admin 189568 Oct 20 09:24 strip
-rwxr-xr-x 1 root admin 329168 Oct 20 09:24 svn
-rwxr-xr-x 1 root admin 111488 Oct 20 09:24 svnadmin
-rwxr-xr-x 1 root admin 98976 Oct 20 09:23 svnbench
-rwxr-xr-x 1 root admin 57008 Oct 20 09:24 svndumpfilter
-rwxr-xr-x 1 root admin 63600 Oct 20 09:23 svnfsfs
-rwxr-xr-x 1 root admin 90848 Oct 20 09:24 svnlook
-rwxr-xr-x 1 root admin 62256 Oct 20 09:23 svnmucc
-rwxr-xr-x 1 root admin 82384 Oct 20 09:24 svnrdump
-rwxr-xr-x 1 root admin 115840 Oct 20 09:24 svnserve
-rwxr-xr-x 1 root admin 83248 Oct 20 09:24 svnsync
-rwxr-xr-x 1 root admin 36400 Oct 20 09:24 svnversion
-rwxr-xr-x 1 root admin 87411088 Oct 20 09:23 swift
lrwxr-xr-x 1 root admin 5 Nov 13 12:35 swift-autolink-extract -> swift
-rwxr-xr-x 1 root admin 5031520 Oct 20 09:23 swift-build
-rwxr-xr-x 1 root admin 384480 Oct 20 09:23 swift-build-tool
-rwxr-xr-x 1 root admin 461136 Oct 20 09:24 swift-demangle
lrwxr-xr-x 1 root admin 5 Nov 13 12:35 swift-format -> swift
-rwxr-xr-x 1 root admin 5031552 Oct 20 09:23 swift-package
-rwxr-xr-x 1 root admin 5031472 Oct 20 09:23 swift-run
-rwxr-xr-x 1 root admin 53024 Oct 20 09:24 swift-stdlib-tool
-rwxr-xr-x 1 root admin 5031504 Oct 20 09:24 swift-test
lrwxr-xr-x 1 root admin 5 Nov 13 12:35 swiftc -> swift
-rwxr-xr-x 1 root admin 12000704 Oct 20 09:23 tapi
-rwxr-xr-x 1 root admin 32592 Oct 20 09:24 unifdef
-rwxr-xr-x 1 root admin 2946 Sep 26 08:55 unifdefall
-rwxr-xr-x 1 root admin 50272 Oct 20 09:24 unwinddump
-rwxr-xr-x 1 root admin 37120 Oct 20 09:23 xml2man
-rwxr-xr-x 1 root admin 135 Sep 26 08:57 yaccLast updated
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