关于shell你不得不掌握的一些脚本（1）

shell脚本之图形打印

利用shell打印三角、矩形、倒直角等等、
先创立一个文件
vi picture.sh
进入文件开始编程

#!/bin/bash
# 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=$i;k<=$len-1;k++))    
 	 	do          
 	 		echo -n "* "    
 	 	done    
 	 	echo 
 done
 

shell编程之截取字符串

利用shell截取字符串中的字符，以便满足工作需求下面就利用以下字符串来编程
：http://www.aaa.com/root/123.htm

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