shell3-pl
ontinuebreak
# vim s25.sh
#!/bin/bash
fori in `seq 1 10`
do
if [ $i -eq 5 ]
then
continue
fi
echo $i
done
#chmod +x s25.sh
#./s25.sh
1
2
3
4
6
7
8
9
10
#vim s25.sh
#!/bin/bash
fori in `seq 1 10`
do
if [ $i -eq 5 ]
then
break
fi
echo $i
done
You have new mail in /var/spool/mail/root
#chmod +x s26.sh
#./s26.sh
1
2
3
4
练习：输入用户名和密码 ，如果是root和redhat，输出“欢迎光临“，如果不正确，输出“不正确，请重新输入用户名和密码“。
# vim s27.sh
#!/bin/bash
while :
do
read -p "请输入用户名：" username
read -s -p "请输入密码：" password
if [ $username -eq "root" -a $password -eq "redhat" ]
then
echo "欢迎光临"
break
else
echo "不正确，请重新输入用户名和密码"
fi
done
~
练习： 限制尝试次数为5次，5次以后禁止使用。
# vim s28.sh
#!/bin/bash
i=1
while [ $i -le 5 ]
do
read -p "请输入用户名：" username
read -s -p "请输入密码：" password
echo
if [ $username == "root" -a $password == "redhat" ]
then
echo "欢迎光临"
break
elif [ $i -eq 5]
then
echo "你无权使用本程序"
break
else
echo "不正确，你还有$次机会，请重新输>入用户名和密码"
fi
i=$[$i+1]
done
# chmod +x s28.sh
# ./s28.sh
-------------------------------
> <|结合done用
1) >
# vim s29.sh
#!/bin/bash
for i in `seq 1 10`
do
echo $i
done>/test/1.txt
# chmod +x s29.sh
#./s29.sh
#cat /test/1.txt
1
2
3
4
5
6
7
8
9
10
--------------------
2)< while循环
批量添加用户
#vimuser_list
utom utomg 2000 /utom /bin/bash utomutom
jarry jarryg 2001 /jarry /bin/zsh jarryjarry
larry larryg 2002 /larry /bin/tcsh larrylarry
#!/bin/bash
#add user scripts
while read line
do
uname=$(echo $line|awk '{print $1}')
gname=$(echo $line|awk '{print $2}')
uid=$(echo $line|awk '{print $3}')
home=$(echo $line|awk '{print $4}')
shell=$(echo $line|awk '{print $5}')
passwd=$(echo $line|awk '{print $6}')
grep "^\" /etc/group &>/dev/null
if [ $? -ne 0 ]
then
groupadd $gname
fi
id $uname &>/dev/null
if [ $? -ne 0 ]
then
useradd -g $gname -u $uid -d $home -s $shell $uname
echo $passwd |passwd --stdin $uname
fi
done/test/ip.txt
while read line
do
ip=$(echo $line|awk '{print $2}')
iptables -I INPUT -s $ip -p tcp --dport 22 -j DROP
done/dev/null
}
wd='192.168.3.'
for i in `seq 1 254`
do
echo $wd$i
done>/tmp/ip1.txt
while read ip
do
testip $ip
if [ $? -eq 0 ]
then
echo $ip >> /tmp/ip.txt
fi
done /root/.ssh/known_hosts
# vim auto.exp
#!/usr/bin/expect
set timeout 60
spawn ssh 192.168.3.2
expect "continue connecting"
send "yes\r"
expect "password:"
send "redhat1\r"
interact
# chmod +x auto.exp
# ./auto.exp
--------------------------
脚本加密
# tar zxvf shc-3.8.7.tgz -C /usr/local/src
shc-3.8.7/CHANGES
shc-3.8.7/Copying
shc-3.8.7/Makefile
shc-3.8.7/match
shc-3.8.7/pru.sh
shc-3.8.7/shc-3.8.7.c
shc-3.8.7/shc.1
shc-3.8.7/shc.README
shc-3.8.7/shc.c
shc-3.8.7/shc.html
shc-3.8.7/test.bash
shc-3.8.7/test.csh
shc-3.8.7/test.ksh
# cd /usr/local/src
# cd shc-3.8.7/
# make
# make test
# make strings
# make expiration
# ./shc -e 13/07/2013 -m "please connect larry@gmail.com" -f /test/aaa.sh
---------------------------------
脚本调试
1） 设置断点echo
2）sh -x file.sh
页:
[1]