1，查询原来安装的列表命令：
bogon:~xxxxx$ gem list
*** LOCAL GEMS ***
activesupport (4.2.10)
atomos (0.1.3)
bigdecimal (default: 1.2.8)
CFPropertyList (3.0.0, 2.2.8)
claide (1.0.2)
cocoapods (1.7.3)
cocoapods-core (1.7.3, 1.7.0, 1.7.0.beta.2, 1.6.1, 1.5.3, 1.3.1)
cocoapods-deintegrate (1.0.3, 1.0.2)
cocoapods-downloader (1.2.2)
cocoapods-plugins (1.0.0)
cocoapods-search (1.0.0)
cocoapods-static-frameworks (0.0.1)
cocoapods-stats (1.0.0)
cocoapods-trunk (1.3.1)
cocoapods-try (1.1.0)
colored2 (3.1.2)
concurrent-ruby (1.1.5, 1.0.5)
did_you_mean (1.0.0)
escape (0.0.4)
fourflusher (2.3.1, 2.2.0, 2.0.1)
fuzzy_match (2.0.4)
gh_inspector (1.1.3)
i18n (0.9.5)
io-console (default: 0.4.5)
json (default: 1.8.3.1)
libxml-ruby (2.9.0)
minitest (5.8.5)
molinillo (0.6.6, 0.5.7)
nanaimo (0.2.6)
nap (1.1.0)
net-telnet (0.1.1)
netrc (0.11.0)
nokogiri (1.5.6)
pods (0.0.1)
power_assert (0.2.6)
psych (default: 2.1.0.1)
rake (10.4.2)
rdoc (default: 4.2.1)
ruby-macho (1.4.0, 1.2.0)
rubygems-update (2.6.14)
sqlite3 (1.3.11)
test-unit (3.1.5)
thread_safe (0.3.6)
tzinfo (1.2.5)
xcodeproj (1.10.0, 1.9.0, 1.8.1, 1.5.9)
2，删除已经安装pod版本
bogon:~ xxxxx$ sudo gem uninstall cocoapods -v 1.7.3
Remove executables:
pod, sandbox-pod
in addition to the gem? [Yn] n
Executables and scripts will remain installed.
Successfully uninstalled cocoapods-1.7.3
3, 安装新指定版本的pod
bogon:~ xxxxxxx$ sudo gem install cocoapods -v 1.7.0 -n /usr/local/bin
Successfully installed cocoapods-1.7.0
Parsing documentation for cocoapods-1.7.0
Installing ri documentation for cocoapods-1.7.0
Done installing documentation for cocoapods after 3 seconds
1 gem installed
4，查看安装的pod的版本
bogon:~xxxxxxxx$ pod --version
---------------------------------------------
Error loading the plugin `cocoapods-static-frameworks-0.0.1`.
Gem::ConflictError - Unable to activate cocoapods-static-frameworks-0.0.1, because cocoapods-1.7.0 conflicts with cocoapods (= 1.3.1)
/Library/Ruby/Site/2.3.0/rubygems/specification.rb:2290:in `raise_if_conflicts'
/Library/Ruby/Site/2.3.0/rubygems/specification.rb:1410:in `activate'
/Library/Ruby/Gems/2.3.0/gems/claide-1.0.2/lib/claide/command/plugin_manager.rb:93:in `safe_activate_and_require'
/Library/Ruby/Gems/2.3.0/gems/claide-1.0.2/lib/claide/command/plugin_manager.rb:31:in `block in load_plugins'
/Library/Ruby/Gems/2.3.0/gems/claide-1.0.2/lib/claide/command/plugin_manager.rb:30:in `map'
/Library/Ruby/Gems/2.3.0/gems/claide-1.0.2/lib/claide/command/plugin_manager.rb:30:in `load_plugins'
/Library/Ruby/Gems/2.3.0/gems/claide-1.0.2/lib/claide/command.rb:326:in `block in run'
/Library/Ruby/Gems/2.3.0/gems/claide-1.0.2/lib/claide/command.rb:325:in `each'
/Library/Ruby/Gems/2.3.0/gems/claide-1.0.2/lib/claide/command.rb:325:in `run'
/Library/Ruby/Gems/2.3.0/gems/cocoapods-1.7.0/lib/cocoapods/command.rb:52:in `run'
/Library/Ruby/Gems/2.3.0/gems/cocoapods-1.7.0/bin/pod:55:in `<top (required)>'
/usr/local/bin/pod:23:in `load'
/usr/local/bin/pod:23:in `<main>'
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