linux - Unable to remove files from directory -

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i using rm delete files directory through perl script throws error
can't exec "rm" no such file or directory.

command goes : 

system("rm $directory$files"); $directory$files = /var/spool/mqueue/qf*

perl has builtin function removing files, unlink. third example shows how use in combination glob delete list of files:

unlink glob "*.bak";

or in case,

unlink glob($directory.$files);

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