script read input from file
 

hi guys
i want the variable GN has the input from file

the echo $GN does show what i want, but only before the "done"
when i echo $GN outside the while-do thing, it goes back to original,means my jailpath cannot get the correct value

any helps on how to solve this? ><
thanks

Try reading the file from the bottom of the loop http://stackoverflow.com/questions/8...e-line-by-line.
Your one opens a new shell (& env) due to the pipe.

As Chris said, try this:

Another description for you:

I set variables in a loop that's in a pipeline. Why do they disappear after the loop terminates? Or, why can't I pipe data to read?

http://mywiki.wooledge.org/BashFAQ/024

Using a redirection for the file input also avoids a Useless Use Of Cat.


And please lose the pointless curly brackets around the variables, ok? They do nothing but clutter up the code. Save the full variable form for when you really need it.

thanks guys, it worked