Beefy Boxes and Bandwidth Generously Provided by pair Networks
Keep It Simple, Stupid

Re: Understanding $?

by kennethk (Abbot)
on Mar 06, 2013 at 22:44 UTC ( #1022112=note: print w/ replies, xml ) Need Help??

in reply to Understanding $?

The docs: $?.

$? is assigned a value in the background on the line @output = `$cmd`;, independent of what you do. The value itself depends on the status code returned from (I presume) iwodstart.

If you have multiple commands in $cmd or any i/o redirects (which you do), then the child process is actually a shell around your command set, and the return value in $? is the returned status code from the shell.

#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

Comment on Re: Understanding $?
Select or Download Code

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1022112]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others musing on the Monastery: (4)
As of 2015-11-28 15:42 GMT
Find Nodes?
    Voting Booth?

    What would be the most significant thing to happen if a rope (or wire) tied the Earth and the Moon together?

    Results (743 votes), past polls