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$ history | awk '{a[$2]++;next}END{for (i in a){print i " --> " a[i]}}' | sort -nr -k3
clear --> 25
cal --> 23
history --> 9
./caldate.sh --> 7
date --> 6
ls --> 2
cd --> 2
pwd --> 1
ps --> 1
man --> 1
env --> 1
echo|awk --> 1
echo --> 1
chmod --> 1
cat --> 1
awk --> 1

$ history | awk '{a[$2]++;next}END{for (i in a){print i " --> " a[i]}}' | sort -nr -k3 clear --> 25 cal --> 23 history --> 9 ./caldate.sh --> 7 date --> 6 ls --> 2 cd --> 2 pwd --> 1 ps --> 1 man --> 1 env --> 1 echo|awk --> 1 echo --> 1 chmod --> 1 cat --> 1 awk --> 1