您如何使用 backticks 运行 pushd 和 popod ?
每次我运行 pushd/tmp 时, 都会在背心中出错 :
"No such file or directory - pushd /tmp"
Ruby shell -outs (backticks) 每人在一个新的下壳中运行, 所以它也许不能按照你的想法运作:
a = `pwd`
`cd /tmp `
b = `pwd`
b == a # => true
b == "/tmp" # => false
而且, 您确定 < code> pushd 在您的外壳中有效吗? 如果您想要比反曲语法更有用的东西, 也许请使用 Ruby s < code> s < code > system 或 < code> popen3 。
Dir#chdir 接受一个区块。 这里的例子来自 docs , 如果您需要在一个目录中运行一些命令, 然后更改回来 :
Dir.chdir("/var/spool/mail")
puts Dir.pwd
Dir.chdir("/tmp") do
puts Dir.pwd
Dir.chdir("/usr") do
puts Dir.pwd
end
puts Dir.pwd
end
puts Dir.pwd
您不能使用“ em> pushd < / em”, 并使用后推键; “ em> pushd Shell 模块获得类似的功能 。
require shell
shell = Shell.new
shell.pushd /tmp
shell.popd
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