测试环境：CentOS6.7
循环创建目录并赋予目录的宿主权限（可读可写可执行），组权限（可读可以执行），其他权限（可读）
#!/bin/bash for((i=0;i<50;i++)) do mkdir -p /home/yucheng/shell_demo/users$i cd /home/yucheng/shell_demo chmod 754 users$i done |
模拟linnux登录shell
#!/bin/bash echo -n "login:" read name echo -n "password:" read passwd if [ $name = "cht" -a $passwd = "abc" ];then echo "the host and password is right!" else echo "input is error!" fi |
比较两个数大小
#!/bin/bash echo "please enter two number" read a read b if test $a -eq $b then echo "NO.1 = NO.2" elif test $a -gt $b then echo "NO.1 > NO.2" else echo "NO.1 < NO.2" fi |
查找/root/目录下是否存在该文件
#!/bin/bash echo "enter a file name:" read a if test -e /root/$a then echo "the file is exist!" else echo "the file is not exist!" fi |
for循环的使用
#!/bin/bash
clear
for num in 1 2 3 4 5 6 7 8 9 10
do
echo "$num"
done
|
删除当前目录下大小为0的文件
#!/bin/bash
for filename in `ls`
do
if test -d $filename
then b=0
else
a=$(ls -l $filename | awk '{ print $5 }')
if test $a -eq 0
then rm $filename
fi
fi
done
|
如果/export/um_lpp_source下有文件，那么将其文件系统大小改为3G
#!/bin/bash
while line=`ls /export/um_lpp_source`
do
if test $line=""
then echo "NULL"
sleep 1
else echo $line
chfs -a size=3G /export/um_lpp_source
exit 0
fi
done
|
测试IP地址
#!/bin/bash
for i in 1 2 3 4 5 6 7 8 9
do
echo "the number of $i computer is "
ping -c 1 192.168.0.$i
done
|
如果test.log的大小大于0，那么将/opt目录下的*.tar.gz文件
#!/bin/sh
a=2
while name="test.log"
do
sleep 1
b=$(ls -l $name | awk '{print $5}')
if test $b -ge $a
#then echo "OK"
then `cp /opt/*.tar.gz .`
exit 0
fi
done
|
给函数传递参数
#!/bin/bash
p_num ()
{
num=$1
echo $num
}
for n in $@
do
p_num $n
done
|
创建文件夹
#!/bin/bash
while :
do
echo "please input file's name:"
read a
if test -e /root/$a
then
echo "the file is existing Please input new file name:"
else
mkdir $a
echo "you aye sussesful!"
break
fi
done
|
获取本机IP地址
#!/bin/bash
ifconfig | grep "inet addr:" | awk '{ print $2 }'| sed 's/addr://g'
|
查找最大文件
#!/bin/bash
a=0
for name in *.*
do
b=$(ls -l $name | awk '{print $5}')
if test $b -ge $a
then a=$b
namemax=$name
fi
done
echo "the max file is $namemax"
|
查找当前网段内IP用户，重定向到ip.txt文件中
#!/bin/bash
a=1
while :
do
a=$(($a+1))
if test $a -gt 255
then break
else
echo $(ping -c 1 192.168.0.$a | grep "ttl" | awk '{print $4}'| sed 's/://g')
ip=$(ping -c 1 192.168.0.$a | grep "ttl" | awk '{print $4}'| sed 's/://g')
echo $ip >> ip.txt
fi
done
|
case语句练习
#!/bin/bash
clear
echo "enter a number from 1 to 5:"
read num
case $num in
1) echo "you enter 1"
;;
2) echo "you enter 2"
;;
3) echo "you enter 3"
;;
4) echo "you enter 4"
;;
5) echo "you enter 5"
;;
*) echo "error"
;;
esac
|
检查端口号是否已启动
#!/bin/bash
n=1
echo "检查xxx服务..."
while true
do
if test $n -gt 20
then
echo "xxx服务启动失败"
break
fi
sleep 5
n=$(($n+1))
port=`netstat -antp | grep "0.0.0.0:8080"`
if [ ${#port} -gt 3 ]; then
echo "xxx服务已经启动"
break;
fi
done
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