09-07-2011
How, exactly, are you measuring "free" memory? It's a common beginner mistake to see "free" low and panic, but it doesn't usually mean you're out of memory -- "cached" is as good as free, so as long as "cached" is high, you've got plenty.
---------- Post updated at 04:55 PM ---------- Previous update was at 04:51 PM ----------
Another thing -- you're saving every single line to a structure in memory. When the output is enormous you'd be better off saving it to a temp file. If it's tiny, saving it to a temp file won't hurt performance because it'll all fit in cache.
Aside from that I don't see anything in this function which would be a memory hog. Depending on what command it's running though, that may end up converting lots of 'free' memory into 'cache' memory (again, harmless.)
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