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作为另一个用户使用here doc在脚本中运行命令

su heredoc bash

4

squarjn · 技术社区 · 9 年前

我希望能够在脚本中间切换用户。这里有一个尝试:

su - User << EOF

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" </dev/null

EOF

中间线路应该安装自制软件。如果我以用户身份登录并独立运行中间行,它安装得很好。但是运行上面的完整脚本会给我带来问题:

-e:5: unknown regexp options - lcal
-e:6: unknown regexp options - lcal
-e:8: unknown regexp options - Cach
-e:9: syntax error, unexpected tLABEL
BREW_REPO = https://github.com/Homebrew/brew.freeze
                  ^
-e:9: unknown regexp options - gthb
-e:10: syntax error, unexpected tLABEL
CORE_TAP_REPO = https://github.com/Homebrew/homebrew-core.freeze
                      ^
-e:10: unknown regexp options - gthb
-e:32: syntax error, unexpected end-of-input, expecting keyword_end
-bash: line 34: end: command not found
-bash: line 36: def: command not found
-bash: line 37: escape: command not found
-bash: line 38: end: command not found
-bash: line 40: syntax error near unexpected token `('
-bash: line 40: `  def escape(n)'

我尝试了不同的命令,而不是仅仅安装自制软件,但大多数时候都有问题。在我尝试向“su”传递命令和作为该用户实际运行命令之间有什么区别?

1 回复 | 直到 9 年前

1

4

janos slartidan 9 年前

$(...) 执行命令之前此处文档传递给 su 也就是说 苏

/usr/bin/ruby -e "#!/System/Library/Frameworks/Ruby.framework/Versions/Current/usr/bin/ruby
# This script installs to /usr/local only. To install elsewhere you can just
# untar https://github.com/Homebrew/brew/tarball/master anywhere you like or
# change the value of HOMEBREW_PREFIX.
HOMEBREW_PREFIX = "/usr/local".freeze
HOMEBREW_REPOSITORY = "/usr/local/Homebrew".freeze
HOMEBREW_CACHE = "#{ENV["HOME"]}/Library/Caches/Homebrew".freeze
...

等等。换句话说,输出 $(...) 已插入此处文档。

为了避免这种情况,你需要逃离 $ :

su - User << EOF

/usr/bin/ruby -e "\$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" </dev/null

EOF

或者,您可以告诉shell,通过封闭起始值,不进行任何插值,直接处理整个here文档 EOF

su - User << "EOF"

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" </dev/null

EOF