排序的字符串如下： the squid project provides a number of resources toassist users design,implement and support squid installations. Please browsethe documentation and support
此题目有多种解法，sed、awk、tr等等,都可以解决此题，命令运用灵活多变。
编写shell脚本
解法1：
#!/bin/bash ###-------------CopyRight-------------
# Name:sort string
# Version Number:1.0
# Type:sh
# Language:bash shell
# Date:--
# Author:sandy
# QQ:
# Email:eeexu123@.com str="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"
#no1按单词出现的频率降序排序
word(){
echo $str|sed 's#[^a-zA-Z]#\n#g'|grep -v "^$"|sort|uniq -c|sort -rn -k1
} #no2按字母出现的频率降序排序
string(){
echo $str|grep -o "."|egrep -v "[^a-zA-Z]"|sort|uniq -c|sort -rn -k1
} menu(){
cat <<END
.按单词出现的频率降序排序
.按字母出现的频率降序排序
END
read -p "Pls you choose num:" num
}
menu usage(){
echo "USAGE:You muset choose 1 or 2"
exit
} case "$num" in
)
word
;;
)
string
;;
*)
usage
esac
解法2:
#!/bin/bash ##-------------CopyRight-------------
# Name:sort string
# Version Number:1.1
# Type:sh
# Language:bash shell
# Date:--
# Author:sandy
# QQ:
# Email:eeexu123@.com str="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"
#no1按单词出现的频率降序排序
word(){
echo $str|tr ' ' '\n'|sort|uniq -c|sort -rn -k1
} #no2按字母出现的频率降序排序
string(){
echo $str|sed -r 's#(.)#\1\n#g'|egrep -v "[^a-zA-Z]|^$"|sort|uniq -c|sort -rn -k1
} menu(){
cat <<END
.按单词出现的频率降序排序
.按字母出现的频率降序排序
END
read -p "Pls you choose num:" num
}
menu usage(){
echo "USAGE:You muset choose 1 or 2"
exit
} case "$num" in
)
word
;;
)
string
;;
*)
usage
esac
执行上述脚本，如果如下：
[root@mysql01 shell]# sh no_20.sh
1.按单词出现的频率降序排序
2.按字母出现的频率降序排序
Pls you choose num:1
2 support
2 squid
2 and
1 users
1 toassist
1 the
1 sections
1 resources
1 provides
1 project
1 Please
1 of
1 number
1 more
1 installations
1 infomation
1 implement
1 for
1 documentation
1 design
1 browsethe
1 a
[root@mysql01 shell]# sh no_20.sh
1.按单词出现的频率降序排序
2.按字母出现的频率降序排序
Pls you choose num:2
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