command opreation
history > history.log
awk '{print $2}' history.log > history_2.log
sort history_2.log | uniq > history_3.log
综合起来
history | awk '{print $2}' | sort | uniq -d | grep -v '#' > result_history.log
history > history.log
awk '{print $2}' history.log > history_2.log
sort history_2.log | uniq > history_3.log
综合起来
history | awk '{print $2}' | sort | uniq -d | grep -v '#' > result_history.log