统计linux命令的频度

history|awk '{a[$2]++ } END{for(i in a){print a[i] " " i}}'|sort -rn |head

很好玩，
还有一个能输出百分比的，


history | awk '{CMD[$2]++;count++;}END { for (a in CMD)print CMD[a] " " CMD[a]/count*100 "% " a;}' | grep -v "./" | column -c3 -s " " -t | sort -nr | nl | head -n10