20: Words and letters to re-order cases

Use the shell to handle the following:

1, according to the frequency of word occurrence descending sort!

2, in descending order by the frequency of letters!

The Squid project provides a number ofresources to assist users design,implement and support squid installations. Please browse the documentation and support sections for more Infomation,byoldboy training.

An enterprise Shell interview exam question in the classroom

http://oldboy.blog.51cto.com/2561410/1686891

Answer:

[[email protected] scripts]# cat Paixu.txt|xargs-n1|awk ' {aa[$1]++} end{for (i in AA) print I,aa[i]} ' |sort-rnk2
Support 2
Squid 2
and 2
Users 1

 [[email protected] scripts]# egrep -o  [a-z]   " Paixu.txt|awk  "  {aa[$1]++} end{for (J In AA) print J,aa[j]}   " | sort -rnk2s  19  e  17  o  16  t  14  n  12  i  12  r  11  

20: Words and letters to re-order cases