1、按单词出现频率降序排序！
2、按字母出现频率降序排序！
the squid project provides a number of resources to assist users design,implement and support squid installations. Please browse the documentation and support sections for more infomation
解答：
[root@oldboy ~]# cat oldboy.txt
the squid project provides a number of resources to assist users design,implement and support squid installations. Please browse the documentation and support sections for more infomation按单词排序解答：法1：
[root@oldboy scripts]# tr ",." " " <oldboy.log|xargs -n 1|sort|uniq -c|sort -rn|head2 the2 support2 squid2 and1 users1 training1 to1 sections1 resources1 provides法2：
[root@oldboy scripts]# tr ",." " " <oldboy.log|xargs -n 1|awk '{S[$1]++}END{for(key in S)print S[key],key}'|sort -rn|head2 the
2 support
2 squid
2 and
1 users
1 training
1 to
1 sections
1 resources
1 provides法3：
[root@oldboy scripts]# awk -F "[,. ]+" '{for(i=1;i<=NF;i++)S[$i]++}END{for(key in S)print S[key],key}' oldboy.log |sort -rn|head
2 the
2 support
2 squid
2 and
1 users
1 training
1 to
1 sections
1 resources
1 provides按字母频率排序
法1
[root@MySQL ~]# tr "{ |,|.}" "\n"<oldboy.txt|awk -F "" '{for(i=1;i<=NF;i++)array[$i]++}END{for(key in array)print array[key],key|"sort -nr"}'
19 s
17 e
16 o
14 t
12 n
12 i
11 r
9 a
8 u
7 p
7 d
6 m
4 l
4 c
3 f
2 q
2 h
2 b
1 w
1 v
1 P
1 j
1 g[root@MySQL ~]# tr "[ ,.]" "\n"<oldboy.txt|awk '{for(i=1; i<=length($0); i++) ++S[substr($0,i,1)]} END {for(a in S) print S[a], a|"sort -rn"}'
19 s
17 e
16 o
14 t
12 n
12 i
11 r
9 a
8 u
7 p
7 d
6 m
4 l
4 c
3 f
2 q
2 h
2 b
1 w
1 v
1 P
1 j
1 g[root@db02 oldboy20151227]# echo "the squid project provides a number of resources toassist users design,implement and support squid installations. Please browsethe documentation and support sections for more infomation"|sed 's# ##g'|sed -r 's#(.)#\1\n#g'|sort|uniq -c|sort -rn -k119 s17 e16 o14 t12 n12 i11 r9 a8 u7 p7 d6 m4 l4 c3 f2 q2 h2 b1 w1 v1 j1 g1 P1 .1 ,1 [root@db02 oldboy20151227]# echo "the squid project provides a number of resources toassist users design,implement and support squid installations. Please browsethe documentation and support sections for more infomation"|sed 's# ##g'|awk -F "" '{for(n=1;n<=NF;n++) print $n}'|sort|uniq -c|sort -k1 -nr19 s17 e16 o14 t12 n12 i11 r9 a8 u7 p7 d6 m4 l4 c3 f2 q2 h2 b1 w1 v1 j1 g1 P1 .1 ,有关AWK数组的超详细案例讲解就在老男孩教育最新高级运维班课程！
