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limit=2000000 #KB
used=$(free -k|sed -n '2p'|awk {'print $3'} ) ; cached=$(free -k|sed -n '2p'|awk {'print $7'})
if [ $used -ge $limit ]; then
echo -e "Used Memory space reached amount to...

$? is the return code form a previous command or function
in unix, 0 is the standard return code for a successful completion

if [$? -ne 0]
The whole line means

'if the previous return code...