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You can't nest [ ].

You can't use && inside [ ]. You can inside [[ ]].

if [ $# != 1 ] || [[ "$1" != "ALL" && "$1" != "PART" ]]; then
# NOTIFY ERROR...
fi

test constructs...

You are focusing too much on RAM. realloc() doesn't care or even use RAM. What this function does is reserving (or releasing) virtual memory. Whether this virtual memory is backed by RAM or not...