Not that this is perl related, but if you're executing
the move command
mv with the same file as both arguments,
mv should fail with an error message.
Your first invocation of system() should execute the
command just as if you had typed it into the shell. Which
can be dangerous -- if you're using the
-T switch
for taint checking, the first version of system will
cause your program to die if the value of $file is obtained
from outsite the source code of your script (from a command
line argument, or from a file
including stdin).
The second invocation of system() should be much safer,
as the array invocation of system() executes the first
argument, and any remaining arguments are passed directly
to the program being executed.
As already asked, what is the output of the program when
you run it?
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