1.打印形状

等腰三角形

read -p "Please input the length: " n
for i in seq 1 $n
do
for ((j=$n;j>i;j–))
do
echo -n " "
done

for m in seq 1 $i
do
echo -n "* "
done
echo
done

倒直角三角形

read -p "Please input the length: " len
for i in seq 1 $len
do
for j in seq $i $len
do
echo -n "* "
done
echo
done

直角三角形

read -p "Please input the length: " len
for i in seq 1 $len
do
for((j=1;j<=$i;j++))
do
echo -n "* "
done
echo
done

菱形

read -p "Please input the length: " n

for i in seq 1 $n
do
for ((j=$n;j>i;j–))
do
echo -n " "
done
for m in seq 1 $i
do
echo -n "* "
done
echo
done

for i in seq 1 $n
do
for((j=1;j<=$i;j++)) do echo -n " " done for((k=$i;j++))doecho−n""donefor((k=i;k<=$len-1;k++))
do
echo -n "* "
done
echo
done

【脚本2】截取字符串

现有一个字符串如下：

http://www.aaa.com/root/123.htm

请根据以下要求截取出字符串中的字符：

1.取出www.aaa.com/root/123.htm

2.取出123.htm

3.取出http://www.aaa.com/root

4.取出http:

5.取出http://

6.取出www.aaa.com/root/123.htm

7.取出123

8.取出123.htm

#!/bin/bash
var=“http://www.aaa.com/root/123.htm”
#1.
echo $var |awk -F ‘//’ ‘{print $2}’
#2.
echo $var |awk -F ‘/’ ‘{print $5}’
#3.
echo $var |grep -o ‘http.*root’
#4.
echo $var |awk -F ‘/’ ‘{print $1}’
#5.
echo $var |grep -o ‘http://’
#6.
echo $var |grep -o ‘www.*htm’
#7.
echo $var |grep -o ‘123’

3.【脚本3】tomcat启动脚本