#监控mysql服务
#!/bin/bash
mysql="/usr/local/mysql/bin/mysql -uroot -p123456"
if $mysql -e "show processlist " &>/dev/null
then
echo "MySQL service is down."
exit
else
$mysql -e "show slave status\G" 2>/dev/null > /tmp/slave.stat
n=`wc -l < /tmp/slave.stat`
if [ $n -eq 0 ]
then
echo "This is master"
else
echo "This is slave."
egrep 'Slave_IO_Running:|Slave_SQL_Running:' /tmp/slave.stat |awk -F ':' '{print $2}' >/tmp/SQL.tmp
if grep -qw "NO" /tmp/SQL.tmp
then
echo "The slave is down."
fi
fi
fi
#删除用户
#!/bin/bash
if [ $# -eq 0 ]
then
echo "Wrong.use \"bash $0 --add username\",or\"bash $0 --del username\",or\"bash $0 --help\"."
exit
fi
user_exist=0 #0用户不存在,1用户存在。
ex_user()
{
if ! id $1 &>/dev/null
then
echo "$1 not exist."
user_exist=0
else
user_exist=1
fi
}
case $1 in
--add)
if [ $# -eq 1 ]
then
echo "Wrong.use \"bash $0 --add username\",or\"bash $0 --del username\",or\"bash $0 --help\"."
exit
else
n=`echo $2 awk -F ',' '{print NF}'`
if [ $n -gt 1 ]
then
for i in `seq 1 $n`
do
username=`echo $2|awk -v j=$i -F ',' '{print $j}' `
ex_user $username
if [ user_exist -eq 0 ]
then
useradd $username
fi
done
else
useradd $2
fi
fi
;;
--del)
if [ $# -gt 2 ]
then
echo "Wrong.use \"bash $0 --add username\",or\"bash $0 --del username\",or\"bash $0 --help\"."
exit
else
n=`echo $2 awk -F ',' '{print NF}'`
if [ $n -gt 1 ]
then
for i in `seq 1 $n`
do
username=`echo $2|awk -v j=$i -F ',' '{print $j}' `
ex_user $username
if [ user_exist -eq 1 ]
then
userdel $username
fi
done
else
userdel $2
fi
fi
;;
--help|*)
echo "use \"bash $0 --add username\",or\"bash $0 --del username\",or\"bash $0 --help\"."
;;
#计算和
#!/bin/bash
sum=0
for i in `seq 1 100`
do
m=$[$i%3]
if [ $m -eq 0 ]
then
sum=$[$sum+$i]
fi
done
echo "和是: $sum "
#加减乘除
#!/bin/bash
is_num()
{
n=`echo $1|sed 's/[0-9]//g'`
if [ -n "$n" ]
then
echo "请输入正确数字。"
fi
}
is_big=0 #0表示大于
big()
{
if [ $# -eq 2 ]
then
echo "请输入两个数字。"
elif [ $1 -gt $2 ]
then
is_big=0
else
is_big=1
fi
}
add()
{
sum=$[$1+$2]
echo "$1+$2=$sum"
}
subtract()
{
if [ $is_big -eq 0 ]
then
cha=$[$1-$2]
else
cha=$[$2-$1]
fi
}
multiply()
{
ji=$[$1*$2]
}
divide()
{
if [ $is_big -eq 0 ]
then
echo "scale=2;$1/$2|bc"
else
echo "scale=2;$2/$1|bc"
fi
}
if [ $# -ne 2 ]
then
echo "需要输入两个参数。"
exit
else
is_num $1
is_num $2
fi
add $1 $2
subtract $1 $2
multiply $1 $2
divide $1 $2
#输入数字
#!/bin/bash
while:
do
read -p "Please input a number:" n
if [ -n "$n" ]
then
echo "请输入一个数字。"
continue
fi
if echo $n |grep -ql 'end'
then
exit
fi
n1=`echo $n| sed 's/[0-9]//g'|wc -l`
if [ $n1 -ne 0 ]
then
echo "清输入纯数字。"
continue
else
echo "你输入的数字是:$n"
fi
done
SHELL训练营--day15_shell练习26-30
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