执行脚本的几种方式：
1. sh a.sh 或者 bash a.sh 调用的是 /bin/bash 进程执行的，所以脚本不需要执行权限。
2. 直接使用绝对路径执行， /home/script/a.sh ，脚本需要有执行权限，如果没有权限可执行 chmod a+x a.sh 加入执行权限。
(lampp启动数据库用的就是： /opt/lampp/lampp startmysql )
sh03.sh 根据时间创建目录
#!/bin/bash
echo -e "I will use 'touch' command to create 3 files."
read -p "Please input your filename:" fileuser filename=${fileuser:-"filename"} echo $filename date1=$(date -d '-2 day' +%Y%m%d) #前两天的日期
date2=$(date -d '-1 day' +%Y%m%d) #前一天的日期
date3=$(date "+%Y%m%d") #下面三行在配置文件名
file1=${filename}${date1}
file2=${filename}${date2}
file3=${filename}${date3} touch "$file1"
touch "$file2"
touch "$file3"
sh04.sh 数字运算
#!/bin/bash
echo -e "You SHOULD input 2 numbers,I will cross them!\n"
read -p "first number: " firstnu
read -p "second number: " secnu
total=$(($firstnu*$secnu))
echo -e "\n The result of $firstnu x $secnu is ==> $total"
sh05.sh 使用 test 判断文件存在和权限
echo -e "Please input a filename,I will check the filename's type and permission. \n\n"
read -p "Input a filename : " filename
test -z $filename && echo "You MUST input a filename." && exit test ! -e $filename && echo "The filename '$filename' DO NOT exist" && exit test -f $filename && filetype="regulare file"
test -d $filename && filetype="directory" test -r $filename && perm="readable"
test -w $filename && perm="$perm writable"
test -x $filename && perm="$perm executable" echo "The filename:$filename is a $filetype"
echo "And the permissions are : $perm"
sh06.sh 使用 [] 中括号做判断
read -p "Please input (Y/N):" yn
[ "$yn" == "Y" -o "$yn" == "y" ] && echo "OK,continue" && exit
[ "$yn" == "N" -o "$yn" == "n" ] && echo "Oh,interrupt!" && exit
echo "I don't know what your choice is" && exit
sh07.sh 脚本传参
echo "The script name is ==> $0"
echo "Total parameter number is ==> $#"
[ "$#" -lt ] && echo "The number of parameter is less than 2. Stop here." && exit
echo "Your whole parameter is ==> '$@'"
echo "The 1st parameter ==> $1"
echo "The 2nd parameter ==> $2"
sh08.sh shift去除参数
echo "Total parameter number is ==> $#"
echo "Your whole parameter is ==> '$@'" shift # 进行第一次 "一个变量的 shift " echo "Total parameter number is ==> $#"
echo "Your whole parameter is ==> '$@'" shift # 进行第二次 "三个变量的 shift "
echo "Total parameter number is ==> $#"
echo "Your whole parameter is ==> '$@'"
sh06-2.sh if...then 单层判断
read -p "Please input (Y/N):" yn if [ "$yn" == "Y" ] || [ "$yn" == "y" ]; then
echo "OK,continue"
exit
fi if [ "$yn" == "N" ] || [ "$yn" == "n" ]; then
echo "Oh,interrupt!"
exit
fi echo "I don't know what your choice is" && exit
sh06-3.sh if...elif...else...fi
read -p "Please input (Y/N):" yn if [ "$yn" == "Y" ] || [ "$yn" == "y" ]; then
echo "OK,continue"
exit
elif [ "$yn" == "N" ] || [ "$yn" == "n" ]; then
echo "Oh,interrupt!"
exit
else
echo "I don't know what your choice is" && exit
fi
sh09.sh
if [ "$1" == "hello" ]; then
echo "Hello,how ary you?"
elif [ "$1" == "" ]; then
echo "You MUST input parameters,ex> {$0 someword}"
else
echo "The only parameter is 'hello',ex> {$0 hello}"
fi
sh10.sh
echo "Now,I will detect your Linux server's services!"
echo -e "The www, ftp, ssh, and mail will be detect! \n" testing=$(netstat -tuln | grep ":80 ")
if [ "$testing" != "" ]; then
echo "WWW is running in your system."
fi
testing=$(netstat -tuln | grep ":22 ")
if [ "$testing" != "" ]; then
echo "SSH is running in your system."
fi
testing=$(netstat -tuln | grep ":21 ")
if [ "$testing" != "" ]; then
echo "FTP is running in your system."
fi
testing=$(netstat -tuln | grep ":25 ")
if [ "$testing" != "" ]; then
echo "Mail is running in your system."
fi
sh11.sh case...esac 判断
case $ in
"hello")
echo "Hello,how are you?"
;;
"")
echo "You MUST input parameters,ex> {$0 someword}"
;;
*)
echo "The only parameter is 'hello',ex> {$0 hello}"
;;
esac
sh12.sh
echo "This program will print your selection !"
read -p "Input your choice: " choice
case $choice in
#case $ in
"one")
echo "Your choice is ONE"
;;
"two")
echo "Your choice is TWO"
;;
"three")
echo "Your choice is THREE"
;;
*)
echo "Usage $0 {one|two|three}"
;;
esac
sh12-2.sh 使用function
function printit(){
echo -n "Your choice is " #加上 -n 可以不断行继续在同一行显示
}
echo "This program will print your selection !"
case $1 in
"one")
printit; echo $1 | tr 'a-z' 'A-Z' #将参数做大小写转换!
;;
"two")
printit; echo $1 | tr 'a-z' 'A-Z'
;;
"three")
printit; echo $1 | tr 'a-z' 'A-Z'
;;
*)
echo "Usage $0 {one|two|three}"
;;
esac
sh12-3.sh function带参数
function printit(){
echo -n "Your choice is $1" #加上 -n 可以不断行继续在同一行显示
}
echo "This program will print your selection !"
case $ in
"one")
printit ;
;;
"two")
printit ;
;;
"three")
printit ;
;;
*)
echo "Usage $0 {one|two|three}"
;;
esac
sh13.sh while do done循环
read -p "Please input yes/YES to stop this program:" yn
while [ "$yn" != "yes" -a "$yn" != "YES" ]
do
read -p "Please input yes/YES to stop this program:" yn
done echo "OK! you input the correct answer."
sh13-2.sh until do done循环
until [ "$yn" == "yes" -o "$yn" == "YES" ]
do
read -p "Please input yes/YES to stop this program:" yn
done
echo "OK! you input the correct answer."
sh14.sh
s=
i=
while [ "$i" != "" ]
do
i=$(($i+)) #每次 i 都会增加1
s=$(($s+$i)) #每次都会累加一次！
done
echo "The result of '1+2+3+...+100' is ==> $s"
sh15.sh for...do...done循环
for animal in dog cat elephant
do
echo "There are ${animal}s..."
done
sh16.sh
users=$(cut -d ':' -f1 /etc/passwd) #获取账号名称
for username in $users #开始循环进行
do
id $username
finger $username
done
sh17.sh (该shell script需要检查，还有问题)
network="192.168.66" #先定义一个域的前面部分
for sitenu in $(seq ) #seq为sequence(连续)的缩写之意
do
#下面的语句取得ping 的回传值是正确的还是失败的
ping -c -w ${network}.${sitenu} &> /dev/null && result= || result=
#开始显示结果是正确的启动(UP) 还是错误的没有连通(DOWN)
if [ "$result" == ]; then
echo "Server ${network}.${sitenu} is UP."
else
echo "Server ${network}.${sitenu} is DOWN."
fi
done
检查网段IP使用情况
#!/bin/bash
#main---
network=192.168.
ping_count=
IP=
:>IP_use
:>IP_idle
:>ping_action
echo "`date "+%Y%m%d %H:%M:%S"`----->脚本开始执行......"
while [ $IP -lt ]
do
host=$network.$IP
echo "-------->开始检测$host服务器通迅是否正常,ping次数$ping_count."
ping $host -c $ping_count >.ping_tmp
sleep
cat .ping_tmp >>ping_action
echo "-------->服务器$host检测已完成."
sum_ping=`tail - .ping_tmp |head - |awk -F, '{print$2}' |cut -c -`
loss_ping=`tail - .ping_tmp |head - |awk -F, '{print$4}'|cut -c -`
if [ $sum_ping -eq $ping_count ];then
echo "-->$host IP 已经在使用中"
echo "-->$host IP 已经在使用中" >>IP_use
else
echo "$host IP 目前空闲:$loss_ping"
echo "$host IP 目前空闲" >>IP_idle
fi
IP=$((IP+))
done
echo "`date "+%Y%m%d %H:%M:%S"`----->脚本运行完毕......"
sh18.sh 遍历目录下文件的权限
#.先看看这个目录是否存在啊？
read -p "Please input a directory:" dir
if [ "$dir" == "" -o ! -d "$dir" ]; then
echo "The $dir is NOT exist in your system."
exit
fi #.开始测试文件。
filelist=$(ls $dir) #列出所有在该目录下的文件名
for filename in $filelist
do
perm=""
test -r "$dir/$filename" && perm="$perm readable"
test -w "$dir/$filename" && perm="$perm writable"
test -x "$dir/$filename" && perm="$perm executable"
echo "The file $dir/$filename's permission is $perm"
done
sh19.sh for...do...done 循环
read -p "Please input a number,I will count for 1+2+...+your_input:" nu
s=
for((i=;i<=$nu;i=i+))
do
s=$(($s+$i))
done
echo "The result of '1+2+3+...+$nu' is ==> $s"