学步园

最近在学习linux，在这里给大家推荐一个网站http://linux.vbird.org/ 上面关于linux的教程写得很好，也避免了我在学习过程中的很多弯路。

程序一：HelloWord,在屏幕输出HelloWord

利用vim 创建一个sh01.sh文件

echo -e "Hello World!/a/n"<br /> exit 0<br />

程序二：将输入参数拼接后输出
read -p "First Name:" firstname<br /> read -p "Last Name:" lastname<br /> echo -e "/n your full name is:$firstname $lastname"
程序三：
根据日期创建文件

echo -e "I will use touch comand to create 3 file./n"<br /> read -p "please input the filename what you want:" fileuser<br /> filename=${fileuser:-"filename"}<br /> date1=`date --date='2 days ago' +%Y%m%d`<br /> file1="$filename""$date1"<br /> touch $file1".log"<br />

程序四：普通计算

[root@localhost scripts]# cat sh4.sh<br /> read -p "first:" first<br /> read -p "second:" second<br /> total=$(($first*$second))<br /> echo -e "/n========>$total"<br />

程序五：查找文件，判定权限
[root@localhost scripts]# cat sh5.sh<br /> echo -e "input filename"<br /> read -p "input the filename you want:" filename<br /> test -z $filename && echo "/filename can't be null" && exit 0<br /> test ! -e $filename && echo "file not exist!" && exit 0<br /> test -f $filename && filetype="regulare file"<br /> test -d $filename && filetype="directory"<br /> test -r $filename && perm="readable"<br /> test -w $filename && perm="$perm writable"<br /> test -x $filename && perm="$perm executable"<br /> echo "The filename:$filename is a $filetype"<br /> echo "And the permission are :$perm"<br />
程序六：if else

[root@localhost scripts]# cat sh6.sh<br /> echo "hello world ,shell"<br /> [ -n "$0" ] && echo "$0" || exit 0<br /> [ -n "$1" ] && echo "$1" || exit 0<br /> echo "shell over!"<br /> exit 0<br /> #调用时采用 sh sh6.sh par1 par2<br /> #其中sh6.sh为第一个参数<br /> #par1为第二个参数<br /> #$0取第一个参数，$1取第二个参数<br />
程序7：if else(2)

[root@localhost scripts]# cat sh7.sh<br /> read -p "yes or no (y/n)?" ny<br /> #注意空格！！<br /> if [ "$ny" == "Y" ] || [ "$ny" == "y" ]; then<br /> echo "OK,continue"<br /> exit 0<br /> fi<br /> if [ "$ny" == "N" ] || [ "$ny" == "n" ]; then<br /> echo "Oh,No,interrupt!"<br /> exit 0<br /> fi<br /> echo "A foolish man! fuck params wrong" && exit 0<br />

程序8：if else(3)

[root@localhost scripts]# cat sh8.sh<br /> read -p "input y/n?" yn<br /> if [ "$yn" == "Y" ] || [ "$yn" == "y" ]; then<br /> echo "Hello World,Yes!"<br /> exit 0<br /> else<br /> echo "fuck ,you choose,N!"<br /> exit 0<br /> fi<br />

程序9：if elif ese

[root@localhost scripts]# cat sh9.sh<br /> read -p "input y/n?" param<br /> if [ "$param" == "y" ]; then<br /> echo "yes,Hello World"<br /> exit 0<br /> elif [ "$param" == "n" ]; then<br /> echo "no,good boy!"<br /> exit 0<br /> else<br /> echo "fuck man ,wrong params!"<br /> fi<br />

程序10：根据端口检测系统服务
#netstat 查询系开的端口，并过滤80端口，httpd使用的是80端口<br /> [root@localhost scripts]# cat sh10.sh<br /> testing=`netstat -tuln | grep ":80"`<br /> if [ "$testing" != "" ]; then<br /> echo "WWW is running in your system."<br /> fi<br />

程序11：时间运算

[root@localhost scripts]# cat sh11.sh<br /> read -p "enter date:" mydate<br /> #简单判断输入的时间是否合法 `是1键左的哦<br /> date_d=`echo $mydate |grep '[0-9]/{8/}'`<br /> if [ "$date_d" == "" ]; then<br /> echo "wrong date"<br /> exit 1<br /> else<br /> echo "date is right,computing..."</p> <p>fi<br /> declare -i date_dem=`date --date="$date_d" +%s`<br /> echo "$date_dem"<br /> declare -i date_now=`date +%s`<br /> declare -i date_total_s=$(($date_dem-$date_now))<br /> echo "$date_total_s"<br /> declare -i date_d=$(($date_total_s/60/60/24))<br /> echo "date is:""$date_d"<br /> exit 0<br />