shell学习三十--综合应用

for循环打印下面这句话中的字母数不大于6的单词

I am oldboy teacher welcome to wolf training class.

[root@node01 day13]# vi arr01.sh 

arr=(I am oldboy teacher welcome to wolf training class.)

for wolf in ${arr[@]}

do

   if [ ${#wolf} -le 6 ]

   then

   echo $wolf

   fi

done

[root@node01 day13]# sh arr01.sh 

I

am

oldboy

to

wolf

class.

[root@node01 day13]# vi arr02.sh 

#!/bin/sh

arr=(I am oldboy teacher welcome to wolf training class.)

for((i=0;i<${#arr[*]};i++))

do

    if [ ${#arr[$i]} -le 6 ]

    then

        echo ${arr[$i]}

    fi

done

[root@node01 day13]# sh arr02.sh 

I

am

oldboy

to

wolf

class.

[root@node01 day13]# vi for.sh 

#!/bin/sh

char="(I am oldboy teacher welcome to wolf training class.)"

for n in $char

do

   if [ ${#n} -le 6 ]

   then 

   echo $n

   fi

done

[root@node01 day13]# sh for.sh 

(I

am

oldboy

to

wolf

#!/bin/sh

for i in I am oldboy teacher welcome to wolf training class.

do

   [  ${#i} -le 6 ] && echo $i

done

[root@node01 day13]# sh for01.sh 

I

am

oldboy

to

wolf

class.

[root@node01 day13]# vi awk.sh

#!/bin/sh

echo "I am oldboy teacher welcome to wolf training class."|awk '{for(i=1;i<=NF;i++) if(length($i)<=6)print $i}'

[root@node01 day13]# sh awk.sh 

I

am

oldboy

to

wolf

class.

[root@node01 day13]#vi wc.sh

#!/bin/sh

for i in I am oldboy teacher welcome to wolf training class.

do

   [ `echo $i|wc -L` -le 6 ] && echo $i

done

------------------------------------------

a、for

b、对字符串长度进行判断

c、wc -L

d、变量子串${#wolf}

e、expr length 

f、awk