cat ~/tmp/output.txt
unitStatus 23 2
isoMode 99 5
isoModeConfig 3 1
occupied 17 4
minValue 104 3
maxValue 74 3
oMinValue 11 2
oMaxValue 12 2
unitStatus2 11 2
isoMode2 26 5
isoModeConfig2 2 1
occupied2 1 1
......
....
..
$sort -k3n ~/tmp/output.txt ### the 3rd column
aoutOverrideLevel 0 0
displayMode 0 0
doutOverrideStates 0 0
passwordCount 0 0
zeroOffset 0 0
ackCount 1 1
actionNEG 2 1
actionNONE 2 1
actionPOS 3 1
audibleHour 1 1
baudRate 3 1
cleanDuration 1 1
cleanTimer 2 1
controlMode 2 1
derivative 2 1
deviceIDoffset 1 1
dp_config 1 1
enableVolOffsetSatus 5 1
filterFactor 3 1
flowMaximum 2 1
flowMinimum 2 1
flowOffset 1 1
hoodLeakage 2 1
integral 2 1
isoModeConfig 3 1
isoModeConfig2 2 1
-k, --key=KEYDEF sort via a key; KEYDEF gives location and type 通过键排序;KEYDEF给出位置和类型
-n, --numeric-sort compare according to string numerical value 根据字符串数值进行比较