Should 6 be 5 (or even 4)? On my Linux system "mount" returns: 
/dev/hda6 on / type ext3 (rw)
0         1  2 3    4    5

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so naturally (split(...))[6] is undef.

Others have commented on your possible misunderstanding of how push works.

Update: I guess it should be 5 since you're assigning to $mnt_acc.

In reply to Re: Dynamic creation of hashes by jdalbec
in thread Dynamic creation of hashes by shamala

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