I would like to execute an OS command from my ruby script but I want to add an argument from a ruby variable.
我想从我的ruby脚本执行一个OS命令,但我想从ruby变量中添加一个参数。
I know that's possible by using keyword system like that :
我知道可以使用这样的关键字系统:
#!/usr/bin/env ruby
directory = '/home/paulgreg/'
system 'ls ' + directory
but is that possible by using the "backquotes or backticks syntax" ? (I mean by using that syntax : ls)
但这可能是通过使用“反引号或反引号语法”吗? (我的意思是使用该语法:ls)
3 个解决方案
#1
6
No, that will just concatenate the output from ls and the contents of directory.
不,这只会连接ls的输出和目录的内容。
But you can do this:
但是你可以这样做:
#!/usr/bin/env ruby
directory = '/home/paulgreg/'
`ls #{directory}`
#2
6
`ls #{directory}`
isn't very safe because you're going to run into problems with path names that have spaces in them.
是不是很安全,因为你将遇到包含空格的路径名的问题。
It's safer to do something like this:
做这样的事更安全:
directory = '/home/paulgreg/'
args = []
args << "/bin/ls"
args << directory
system(*args)
#3
1
Nick is right, but there is no need to assemble the args piecewise:
尼克是对的,但没有必要分段组装args:
directory = '/Volumes/Omg a space/'
system('/bin/ls', directory)
#1
6
No, that will just concatenate the output from ls and the contents of directory.
不,这只会连接ls的输出和目录的内容。
But you can do this:
但是你可以这样做:
#!/usr/bin/env ruby
directory = '/home/paulgreg/'
`ls #{directory}`
#2
6
`ls #{directory}`
isn't very safe because you're going to run into problems with path names that have spaces in them.
是不是很安全,因为你将遇到包含空格的路径名的问题。
It's safer to do something like this:
做这样的事更安全:
directory = '/home/paulgreg/'
args = []
args << "/bin/ls"
args << directory
system(*args)
#3
1
Nick is right, but there is no need to assemble the args piecewise:
尼克是对的,但没有必要分段组装args:
directory = '/Volumes/Omg a space/'
system('/bin/ls', directory)