shell 对字符的求长

一,测试环境

echo "To the world you may be one person but to one person you may be the world"

对于世界而言，你是一个人；但是对于某个人，你是他的整个世界

二 , 解

　　01,数组

　　　　　判断一段里面小于4的字符串

#!/bin/bash
#################################################
#    File Name: arrs01.sh
#       Author: kingle
#         Mail: kingle_work@163.com
#     Function:
# Created Time: 2018年11月06日 星期二 16时13分16秒
#################################################
array=(To the world you may be one person but to one person you may be the world)
for word in ${array[@]}
do
    if [ ${#word} -lt 4 ]
    then
        echo ${word}
    fi
done

　　　　　　操作结果　　

[root@kingle conpa]# sh arrs01.sh
To
the
you
may
be
one
but
to
one
you
may
be
the

　　02,数组

　　　　　　实现代码

#!/bin/bash
#################################################
#    File Name: arrs01.sh
#       Author: kingle
#         Mail: kingle_work@163.com
#     Function:
# Created Time: 2018年11月06日 星期二 16时13分16秒
#################################################
array=(To the world you may be one person but to one person you may be the world)
for ((i=;i<${#array[@]};i++))
do
    if [ ${#array[i]} -lt 4 ]
    then
        echo ${array[i]}
    fi
done

　　　　　　操作结果　　　　　

[root@kingle conpa]# sh arrs02.sh
To
the
you
may
be
one
but
to
one
you
may
be
the

　　　　

　　　03,awk　　

[root@kingle conpa]# echo "To the world you may be one person but to one person you may be the world"|awk '{for(i=1;i<=NF;i++)if(length($i)<4)print $i}'
To
the
you
may
be
one
but
to
one
you
may
be
the

　　　04,awk

[root@kingle conpa]# echo "To the world you may be one person but to one person you may be the world"|xargs -n1|awk '{if(length($1)<4)print $1}'
To
the
you
may
be
one
but
to
one
you
may
be
the

　　　05.awk

　　　　　　

[root@kingle conpa]# echo "To the world you may be one person but to one person you may be the world"|awk '{for(i=1;i<=NF;i++)if(length($i)<4)print $i;else print "yes"}'
To
the
yes
you
may
be
one
yes
but
to
one
yes
you
may
be
the
yes