Homebrew简介与安装

# lrwxr-xr-x中的l表示link（链接)，->表示链接的文件 
$ ls -l /usr/local/bin/cmake
lrwxr-xr-x  1 ***  ***  31 12  1 09:23 /usr/local/bin/cmake -> ../Cellar/cmake/3.7.0/bin/cmake

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

# 命令形式： brew install software-name

# 安装wget
$ brew install wget
==> Installing dependencies for wget: openssl
==> Installing wget dependency: openssl
==> Downloading https://homebrew.bintray.com/bottles/openssl-1.0.2j.el_capitan.bottle.tar.gz
######################################################################## 100.0%
==> Pouring openssl-1.0.2j.el_capitan.bottle.tar.gz
==> Using the sandbox
==> Caveats
A CA file has been bootstrapped using certificates from the SystemRoots
keychain. To add additional certificates (e.g. the certificates added in
the System keychain), place .pem files in
  /usr/local/etc/openssl/certs

and run
  /usr/local/opt/openssl/bin/c_rehash

This formula is keg-only, which means it was not symlinked into /usr/local.

Apple has deprecated use of OpenSSL in favor of its own TLS and crypto libraries

Generally there are no consequences of this for you. If you build your
own software and it requires this formula, you'll need to add to your
build variables:

    LDFLAGS:  -L/usr/local/opt/openssl/lib
    CPPFLAGS: -I/usr/local/opt/openssl/include
    PKG_CONFIG_PATH: /usr/local/opt/openssl/lib/pkgconfig

==> Summary
��  /usr/local/Cellar/openssl/1.0.2j: 1,695 files, 12M
==> Installing wget
==> Downloading https://homebrew.bintray.com/bottles/wget-1.18.el_capitan.bottle.tar.gz
######################################################################## 100.0%
==> Pouring wget-1.18.el_capitan.bottle.tar.gz
��  /usr/local/Cellar/wget/1.18: 9 files, 1.6M

# 命令形式： brew uninstall software-name

# 卸载wget
$ brew uninstall wget
Uninstalling /usr/local/Cellar/wget/1.18... (9 files, 1.6M)

# 命令形式： brew list

$ brew list
cmake       maven       node        openssl     pkg-config  wget        xz

# 命令形式：brew outdated

$ brew outdated
node (6.5.0) < 7.2.0
pkg-config (0.29.1_1) < 0.29.1_2

# 命令形式：brew update

$ brew update
Already up-to-date.

# 命令形式：brew info

$ brew info
7 kegs, 7,868 files, 95.5M

# 命令形式：brew upgrade software-name

$ brew upgrade pkg-config
==> Upgrading 1 outdated package, with result:
pkg-config 0.29.1_2
==> Upgrading pkg-config
==> Downloading https://homebrew.bintray.com/bottles/pkg-config-0.29.1_2.el_capitan.bottle.tar.gz
######################################################################## 100.0%
==> Pouring pkg-config-0.29.1_2.el_capitan.bottle.tar.gz
Error: The `brew link` step did not complete successfully
The formula built, but is not symlinked into /usr/local
Could not symlink bin/pkg-config
Target /usr/local/bin/pkg-config
is a symlink belonging to pkg-config. You can unlink it:
  brew unlink pkg-config

To force the link and overwrite all conflicting files:
  brew link --overwrite pkg-config

To list all files that would be deleted:
  brew link --overwrite --dry-run pkg-config

Possible conflicting files are:
/usr/local/bin/pkg-config -> /usr/local/Cellar/pkg-config/0.29.1_1/bin/pkg-config
/usr/local/share/aclocal/pkg.m4 -> /usr/local/Cellar/pkg-config/0.29.1_1/share/aclocal/pkg.m4
/usr/local/share/doc/pkg-config/pkg-config-guide.html
/usr/local/share/doc/pkg-config/pkg-config-guide.html
/usr/local/share/man/man1/pkg-config.1 -> /usr/local/Cellar/pkg-config/0.29.1_1/share/man/man1/pkg-config.1
==> Summary
��  /usr/local/Cellar/pkg-config/0.29.1_2: 10 files, 627.4K

$ brew link --overwrite pkg-config

# 命令形式：brew search software-name

$ brew search wget
wget ✔                                                                                                                                  wgetpaste