[Techtalk] using shell commands in perl scripts

Meredydd meredydd at everybuddy.com
Sun May 25 18:22:31 EST 2003

On Sunday 25 May 2003 13:11, Rasjid Wilcox wrote:
> I'm really not sure what you are asking here.  In all three cases /bin/ls
> is run as a child process.  It has to be a seperate process, and since it
> is invoked by the perl script, it is its child.  I assume there is a way to
> start a process so that it is not a child process, but I've never looked
> into it.

Actually, there isn't. If you look at the output of "pstree", you'll see that 
everything is a child process of something else, right the way up to the 
"mother of all processes", init, which is started by the kernel. If a 
process's parent dies, it is simply reassigned to its parent's parent 
(grandparent? :-P). As init cannot die, this produces a neat little 
self-contained process tree.


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