为什么在Ruby on Rails中使用“ awk”命令不将任何内容返回变量？

Question

Currently I am working on a task in which i have to read zipped file and list its contents. I am using bash script code in my controller file files = tar tf 3578336.tar.xz | awk -F'/' '{ for (i=1;i<5;i++) print "/"$i ; print "\\n"}' ORS='' |grep "/"|uniq files = tar tf 3578336.tar.xz | awk -F'/' '{ for (i=1;i<5;i++) print "/"$i ; print "\\n"}' ORS='' |grep "/"|uniq files = tar tf 3578336.tar.xz | awk -F'/' '{ for (i=1;i<5;i++) print "/"$i ; print "\\n"}' ORS='' |grep "/"|uniq . I am trying to get content using this command but I am unable to get the response in variable. If i am using files = tar tf 3578336.tar.xz then It returns all the contents. What I am trying to do is to list the directories and files according to their levels. It is like creating a file management system for a zipped file.

Any help would be appreciated.

Answer 1

Could you post some sample input/output data, to see what is what you want?

I don't have a *nix near but you can check if tar is writing the output to stderr or stdout, something like this:

tar tf 3578336.tar.xz 2>/dev/null   #If you can see the filenames, then it writes to stdout

tar tf 3578336.tar.xz >/dev/null   #If you can see the filenames, then it writes to stderr