Beefy Boxes and Bandwidth Generously Provided by pair Networks
more useful options

Re: File created but blank

by pc88mxer (Vicar)
on Jul 24, 2008 at 03:23 UTC ( #699760=note: print w/replies, xml ) Need Help??

in reply to File created but blank

If you checked the return status of your open(PL, ...) call, I bet you would find out that it failed. Since there is no pipe symbol at the end of the file name, you are actually asking perl to read a file with a lot of shell metacharacters in it.

An easier way is just to use system() to directly invoke the command:

system("grep 'packet loss' ... > /home/.../$TARGET_HOST.PL.log");
If you wanted to open a pipe from the command, you would need to terminate it with a pipe symbol, e.g.
open(PL, "grep ... | ... |") or die "unable to open pipe from grep command: $!"; while (<PL>) { ... } close(PL);

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://699760]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others meditating upon the Monastery: (15)
As of 2016-10-21 12:41 GMT
Find Nodes?
    Voting Booth?
    How many different varieties (color, size, etc) of socks do you have in your sock drawer?

    Results (289 votes). Check out past polls.