安装cocoapods 报错
rvm -v
rvm 1.29.10 (latest) by Michal Papis, Piotr Kuczynski, Wayne E. Seguin [https://rvm.io]
ruby- v 版本 是2.6.3 ，看到最新的则安装了2.7.0
kk@jritdeMacBook-Pro ~ % ruby list known
Traceback (most recent call last):
ruby: No such file or directory -- list (LoadError)
kk@jritdeMacBook-Pro ~ % rvm list known
# MRI Rubies
[ruby-]1.8.6[-p420]
[ruby-]1.8.7[-head] # security released on head
[ruby-]1.9.1[-p431]
[ruby-]1.9.2[-p330]
[ruby-]1.9.3[-p551]
[ruby-]2.0.0[-p648]
[ruby-]2.1[.10]
[ruby-]2.2[.10]
[ruby-]2.3[.8]
[ruby-]2.4[.9]
[ruby-]2.5[.7]
[ruby-]2.6[.5]
[ruby-]2.7[.0]
ruby-head
kk@jritdeMacBook-Pro ~ % rvm install 2.7.0
Searching for binary rubies, this might take some time.
No binary rubies available for: osx/10.15/x86_64/ruby-2.7.0.
Continuing with compilation. Please read 'rvm help mount' to get more information on binary rubies.
Checking requirements for osx.
Error: Calling `brew list` to only list formulae is disabled! Use `brew list --formula` instead.
Error: Calling `brew list` to only list formulae is disabled! Use `brew list --formula` instead.
Error: Calling `brew list` to only list formulae is disabled! Use `brew list --formula` instead.
Error: Calling `brew list` to only list formulae is disabled! Use `brew list --formula` instead.
Error: Calling `brew list` to only list formulae is disabled! Use `brew list --formula` instead.
Error: Calling `brew list` to only list formulae is disabled! Use `brew list --formula` instead.
Error: Calling `brew list` to only list formulae is disabled! Use `brew list --formula` instead.
Error: Calling `brew list` to only list formulae is disabled! Use `brew list --formula` instead.
Error: Calling `brew list` to only list formulae is disabled! Use `brew list --formula` instead.
Error: Calling `brew list` to only list formulae is disabled! Use `brew list --formula` instead.
Error: Calling `brew list` to only list formulae is disabled! Use `brew list --formula` instead.
Error: Calling `brew list` to only list formulae is disabled! Use `brew list --formula` instead.
Installing requirements for osx.
Updating system - please wait
Installing required packages: autoconf, automake, libtool, pkg-config, coreutils, libyaml, libksba, readline, zlib, openssl@1.1 - please wait
Updating certificates bundle '/usr/local/etc/openssl@1.1/cert.pem'
Requirements installation successful.
Installing Ruby from source to: /Users/kk/.rvm/rubies/ruby-2.7.0, this may take a while depending on your cpu(s)...
ruby-2.7.0 - #downloading ruby-2.7.0, this may take a while depending on your connection...
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 14.0M 100 14.0M 0 0 100k 0 0:02:23 0:02:23 --:--:-- 2249k
ruby-2.7.0 - #extracting ruby-2.7.0 to /Users/kk/.rvm/src/ruby-2.7.0 - please wait
ruby-2.7.0 - #configuring - please wait
ruby-2.7.0 - #post-configuration - please wait
ruby-2.7.0 - #compiling - please wait
ruby-2.7.0 - #installing - please wait
ruby-2.7.0 - #making binaries executable - please wait
Installed rubygems 3.1.2 is newer than 3.0.9 provided with installed ruby, skipping installation, use --force to force installation.
ruby-2.7.0 - #gemset created /Users/kk/.rvm/gems/ruby-2.7.0@global
ruby-2.7.0 - #importing gemset /Users/kk/.rvm/gemsets/global.gems - please wait
ruby-2.7.0 - #generating global wrappers - please wait
ruby-2.7.0 - #gemset created /Users/kk/.rvm/gems/ruby-2.7.0
ruby-2.7.0 - #importing gemsetfile /Users/kk/.rvm/gemsets/default.gems evaluated to empty gem list
ruby-2.7.0 - #generating default wrappers - please wait
ruby-2.7.0 - #adjusting #shebangs for (gem irb erb ri rdoc testrb rake).
Install of ruby-2.7.0 - #complete
Ruby was built without documentation, to build it run: rvm docs generate-ri
kk@jritdeMacBook-Pro ~ % rvm -v
rvm 1.29.10 (latest) by Michal Papis, Piotr Kuczynski, Wayne E. Seguin [https://rvm.io]
kk@jritdeMacBook-Pro ~ % ruby -v
ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-darwin19]
列出最新版本是2.7.0，但是安装2.7.0报了很多错误，先是更新brew ，多次执行这些命令，有时可能是网的问题
brew update
过程比较漫长，折腾一下午时间，最后成功安装
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