shell之脚本片断

16.

以下是平台信息
CentOS Linux release 7.1.1503 (Core)
Linux mysql-dev1 3.10.0-229.el7.x86_64 #1 SMP Fri Mar 6 11:36:42 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

   25  curl -O http://memcached.org/files/memcached-1.4.25.tar.gz
   26  curl -O http://mirrors.cnnic.cn/apache/zookeeper/stable/zookeeper-3.4.8.tar.gz
   27  curl -O http://www.apache.org/dyn/closer.cgi?path=/activemq/5.9.1/apache-activemq-5.9.1-bin.tar.gz 官网提供的这个链接无效
   28  curl -O http://archive.apache.org/dist/activemq/5.9.1/apache-activemq-5.9.1-bin.tar.gz
   31  curl -O https://github.com/libevent/libevent/releases/download/release-2.0.22-stable/libevent-2.0.22-stable.tar.gz



1.免密码登录，就这两步
ssh-keygen -t rsa -P ''
scp .ssh/id_rsa.pub 192.168.1.242:/root/.ssh/authorized_keys

[root@manage ~]# cat manager.sh
while echo "please input host which you want connect: "
do select host in 240 241 242 238-db 247-db 248-db
   do
   break
   done
        case $host in
         "240") ssh 192.168.1.240;;
         "241") ssh 192.168.1.241;;
         "242") ssh 192.168.1.242;;
      "238-db") ssh 192.168.1.238;;
      "247-db") ssh 192.168.1.247;;
      "248-db") ssh 192.168.1.248;;
           *)  break;;
        esac
done


2.安装jdk与tomcat
mkdir packages
cd packages/
curl -O ftp://192.168.1.100/03%BF%AA%B7%A2%B9%A4%BE%DF/Java/jdk/jdk-7u79-linux-x64.rpm
curl -O ftp://192.168.1.100/03%BF%AA%B7%A2%B9%A4%BE%DF/Tomcat/apache-tomcat-8.0.30.tar.gz

rpm -ivh jdk-7u79-linux-x64.rpm
cat <<EOF > /etc/profile.d/java.sh
JAVA_HOME=/usr/java/jdk1.7.0_79
CLASSPATH=$CLASSPATH:$JAVA_HOME/lib
PATH=$JAVA_HOME/bin:$PATH
export JAVA_HOME PATH CLASSPATH
EOF
source /etc/profile

tar zxvf apache-tomcat-8.0.30.tar.gz
./apache-tomcat-8.0.30/bin/startup.sh

3.安装mysql

#hostnamectl set-hostname mysql-test-cn
#systemctl stop firewalld
#cd /root/packages/mysql
#yum -y install perl net-tools nfs-utils
#systemctl start rpcbind
#rpm -e --nodeps mariadb-libs
#mount 192.168.1.250:/nfs/html /mnt
#cd /mnt
#rpm -ivh mysql-commercial-client-5.7.10-1.1.el7.x86_64.rpm mysql-commercial-common-5.7.10-1.1.el7.x86_64.rpm mysql-commercial-libs-5.7.10-1.1.el7.x86_64.rpm mysql-commercial-server-5.7.10-1.1.el7.x86_64.rpm
#systemctl start mysqld
pass=$(grep "temporary password" /var/log/mysqld.log |awk  -F ': ' '{print $2}')
mysql --connect-expired-password -p"$pass" <<EOF
SET PASSWORD FOR 'root'@'localhost'= "123456";
grant all privileges on *.* to 'root'@'%' identified by '123456' with grant option;
EOF
#cd
#umount /mnt
echo $PWD

4.安装memcached

memcached 1.4.15
libevent 2.0.21-stable

yum install memcached
vi /etc/sysconfig/memcached
grep mem /etc/passwd
systemctl status memcached
systemctl start memcached
systemctl enable memcached
systemctl status memcached
memcached-tool  127.0.0.1:11211 stats

5.安装zookeeper
tar zxvf zookeeper-3.4.8.tar.gz
cd zookeeper-3.4.8
cp conf/zoo_sample.cfg conf/zoo.cfg
mkdir /home/zookeeper
vi conf/zoo.cfg
./bin/zkServer.sh start/stop
ss -lnp|grep zoo
ss -lnp|grep 2181
./bin/zkCli.sh -server 127.0.0.1:2181

6.安装activemq
tar zxvf apache-activemq-5.9.1-bin.tar.gz
cd packages/apache-activemq-5.9.1
./bin/activemq start
ss -lnp|grep 8161
ss -lnp|grep 11211
ss -lnp|grep java

15.

[Tue Jan 19 11:23:47 1101 /dev/pts/0 192.168.2.250 ~/sh]#bash legs
please enter name of an animal: ii
the ii has an unknown number of legs.
[Tue Jan 19 11:24:28 1101 /dev/pts/0 192.168.2.250 ~/sh]#bash legs
please enter name of an animal: dog
the dog has four legs.
[Tue Jan 19 11:25:20 1102 /dev/pts/0 192.168.2.250 ~/sh]#cat legs
echo -n "please enter name of an animal: "
read animal
echo -n "the $animal has "
case $animal in
  horse|dog|cat)echo -n "four";;
  man|kangaroo)echo -n "two";;
  *)echo -n "an unknown number of";;
esac
echo " legs."

14.删除程序产生的日志，只保留一个当天日期的文件，并且在每天20点时清空此文件，感觉有点重复，要么只保留一个文件，要么清空都可以达到减少占用磁盘的目的。

[Thu Mar 26 10:01:40 1071 /dev/pts/1 192.168.2.109 /usr/local/ps/log]#cat /var/prtg/scripts/pslog
#find /usr/local/ps/log  -ctime +0|xargs rm -rf
#>/usr/local/ps/log/debug*
a=debug`date +%Y%m%d`.log
for i in `ls *.log`
do
if [ "$i" != "$a" ]
 then
 rm -rf $i
 else
 >$i
fi
done

13.

黑白棋盘
其实是个双循环，
外层执行第一层循环时
内层共执行8次，并判断是单或双，
是单的话，total是双，tmp余数是0，输出背景为灰的两个空格
是双的话，total是单，tmp余数是1，输出背景为黑的两个空格
外层第一层最后一个echo ""是换行
然后执行第二层外循环
[Wed Mar 25|15:40:23 ~ 1081 /bin/bash ]# cat black
#!/bin/bash
for((i=1;i<=8;i++))
 do
    for((j=1;j<=8;j++))
    do
       total=$(($i+$j))
       tmp=$(($total%2))
       if [ $tmp -eq 0 ]
       then
           echo -e -n "33[47m  33[0m"
       else
           echo -e -n "33[40m  33[0m"
       fi
    done
    echo ""
 done


[Wed Mar 25|15:40:46 ~ 1082 /bin/bash ]# cat .bashrc
# .bashrc

# User specific aliases and functions

alias rm='rm -i'
alias cp='cp -i'
alias mv='mv -i'

# Source global definitions
if [ -f /etc/bashrc ]; then
        . /etc/bashrc
fi
#PS1='[u@h W]$ '
export PS1='[d|	 w ! $SHELL ]$ '

12.

因为有好多的safe进程，所以把每一个列出来并杀死
[root@aster3 ~]# cat a
a=`ps -ef|grep safe|grep -v grep|awk '{print $2}'`
for i in $a
 do
 kill -9 $i
 done

清空每一个日志文件
[root@84-monitor monitorlog]# cat a
for i in `ls *.log`
do
#echo $i
> $i
done

11.

日常工作中，处理数据难免会遇到遍历，for循环可能是我们用的比较多的了。本节就来探讨下for语句嵌套循环的性能，猜想下面两个语句的性能。
外层循环越少效率越高
[root@250-shiyan sh]# cat inlinefor
for (( i=1; i<100; i++ ))
do
 for (( c=1; c<1000; c++ ))
  do
  echo "$c-----inline"
  done
echo "$i-----outline"
done
[root@250-shiyan sh]# cat outlinefor
for (( i=1; i<1000; i++ ))
do
 for (( c=1; c<100; c++ ))
  do
  echo "$c-----inline"
  done
echo "$i-----outline"
done
[root@250-shiyan sh]# time (bash inlinefor) |tail -3
998-----inline
999-----inline
99-----outline

real    0m1.754s
user    0m1.433s
sys     0m0.319s
[root@250-shiyan sh]# time (bash outlinefor) |tail -3
98-----inline
99-----inline
999-----outline

real    0m1.731s
user    0m1.392s
sys     0m0.338s

[root@250-shiyan sh]# time (bash inlinefor) |tail -3
9998-----inline
9999-----inline
999-----outline

real    3m8.818s
user    2m25.615s
sys     0m43.021s
[root@250-shiyan sh]# time (bash outlinefor) |tail -3
998-----inline
999-----inline
9999-----outline

real    3m5.233s
user    2m21.791s
sys     0m43.278s

10.脚本执行方式及子进程关系

###4种方式：全路径/path/to/conns|bash conns|source conns|. conns
###要有执行权限产生子shell
[root@250-shiyan prog]# cat conns
#!/bin/bash
ip_conns=`ssh $1 "netstat -ant| grep EST | wc -l"`
echo $ip_conns
[root@250-shiyan prog]# chmod u+x conns
[root@250-shiyan prog]# cp conns /usr/bin
[root@250-shiyan prog]# conns 192.168.2.109
[root@250-shiyan prog]# ./conns
root@192.168.2.109's password:
851
###无需执行权限,产生子shell
[root@250-shiyan prog]# bash conns
root@192.168.2.109's password:
855
[root@84-monitor ~]# cat a
a=192.168.2.109
ip_conns=`ssh $a "netstat -ant| grep EST | wc -l"`
echo $ip_conns
###source命令与点命令是在当前shell中执行，并不产生子shell，也不需要脚本有执行权限。
[root@84-monitor ~]# source a
860
[root@84-monitor ~]# . a
860

9.

shell 判断字符串中是否含有指定字符
new=sdd
ps=s
echo "$new" |grep -q "$ps"
if [ $? -eq 0 ]
then
echo "yes"
else
echo "no"
fi
 
判断某年某天是星期几？
year=1980
end_year=2010
day_2=10/22
week_2=Fri
 
while [ $year -lt $end_year ]
do
new=`date -d "$day_2 CST $year"`
echo "$new"
echo "$new" |grep -q "$week_2"
if [ $? -eq 0 ]
then      
      #  year=`expr $year + 1`
echo "this year $year include $week_2"
    year=`expr $year + 1`
else
    #echo "this year $year include $week_2"
    year=`expr $year + 1`
fi  
done

[root@250-shiyan prog]# expr length "$HOME"
5
[root@250-shiyan prog]# echo "$HOME"|wc -c
6
[root@250-shiyan prog]# echo “$HOME”|awk '{print length($0)}'
7

判断字符串为空的方法有三种：
if [ "$str" =  "" ]
if [ x"$str" = x ]
if [ -z "$str" ] （-n 为非空）
注意：都要用双引号，否则有些命令会报错，养成好习惯吧！

8.

[root@250-shiyan frag]# bash here.sh
USAGE: xtitlebar [-h] "string_for_titelbar"
OPTIONS: -h help text
EXAMPLE: xtitlebar "cvs"
[root@250-shiyan frag]# cat here.sh
help()
{
cat <<HELP
USAGE: xtitlebar [-h] "string_for_titelbar"
OPTIONS: -h help text
EXAMPLE: xtitlebar "cvs"
HELP
exit 0
}
help

7.还有点问题，2015/5/25的时候才搞明白下面的问题所在。才理解了下面的这段脚本含义。

[root@250-shiyan frag]# bash while2.sh
enter y/n :
y
===============================================
| unix script test |
| 1 --- num 1 |
| 2 --- num 2 |
| 3 --- num 3 |
| 4 --- num 4 |
===============================================
enter y/n :
n
Press <return> to proceed or type q to quit:
ef
Press <return> to proceed or type q to quit:
ef
Press <return> to proceed or type q to quit:
q
[root@250-shiyan frag]# cat while2.sh
#!/bin/bash
banner()
{
cat <<echo1
===============================================
| unix script test |
| 1 --- num 1 |
| 2 --- num 2 |
| 3 --- num 3 |
| 4 --- num 4 |
===============================================
echo1
}

getyn()
{
while echo "enter y/n :"
do
read yn
case $yn in
[Yy]) return 0 ;;
yes) return 0 ;;
YES) return 0 ;;
[Nn]) return 1 ;;
no) return 1;;
NO) return 1;;
* ) echo "only accept Y,y,N,n,YES,yes,NO,no";;
esac
done
}

pause()
{
while echo "Press <return> to proceed or type q to quit:"
do
read cmd
case $cmd in
####break跳出while语句
[qQ]) exit 1;;
####引号中间没有任何字符，表示是return
"") break;;
####continue继续下一循环
*) continue;;
esac
done
}

####pause or getyn to test
while getyn 　　　
do
banner
done
pause

6.

[root@250-shiyan frag]# bash while.sh
input num:
4
input is 4
new num is 5
new num is 6
new num is 7
new num is 8
new num is 9
new num is 10
[root@250-shiyan frag]# cat while.sh
#!/bin/bash
echo "input num:"
read num
echo "input is $num"
while test $num -lt 10
do
num=$(($num+1))
echo "new num is $num"
sleep 2
done

5.

[root@localhost script]# cat >if-1
#!/bin/bash
echo -e "are you ok(y/n or maybe)? c"
read answer
if [[ $answer == [yY]* || $answer = maybe ]]
then echo "glad to hear it"
fi
[root@localhost script]# bash if-1
are you ok(y/n or maybe)? dk
[root@localhost script]# bash if-1
are you ok(y/n or maybe)? y
glad to hear it
[root@localhost script]# bash if-1
are you ok(y/n or maybe)? Y
glad to hear it
[root@localhost script]# bash if-1
are you ok(y/n or maybe)? maybe
glad to hear it

4.||表示只要其中之一个，满足即可，&&表示两个，以至n个条件都要满足才可以。

####也可以一试
if [[ "$s" -gt "0" ||  "$r" -gt "0" ]]

[root@localhost script]# cat >if-2
#!/bin/bash
echo -e "how old are you? c"
read age
if (( age < 0 || age > 120 ))
then echo "you are so old"
####两个同时满足，即上限与下限
elif (( age >=0 && age <= 12 ))
then echo "you are child"
elif (( age >=13 && age <=19 ))
then echo "you are 13-19 years old"
elif (( age >=20 && age <=29 ))
then echo "you are 20-29 years old"
elif (( age >=30 && age <=39 ))
then echo "you are 30-39 years old"
else echo "you are above 40"
fi
[root@localhost script]# bash if-2
how old are you? 30
you are 30-39 years old
[root@localhost script]# bash if-2
how old are you? 28
you are 20-29 years old
[root@localhost script]# bash if-2
how old are you? 400
you are so old
[root@localhost script]# bash if-2
how old are you? 0
you are child

3.检查根分区，循环做两件事，a.输出当前值，b.如果大于10%，则输出信息

[root@250-shiyan sh]# cat check-root.sh
#!/bin/bash
while sleep 5
  do
    for i in `df -h |sed -n '//$/p'|awk '{print $5}'|sed 's/\%//g'`
         do echo $i
         if [ $i -ge 10 ]
         then
         echo " more than 10$ linux of disk space."
         fi
         done
  done

[root@250-shiyan sh]# bash check-root.sh
11
 more than 10$ linux of disk space.
11
 more than 10$ linux of disk space.

2.自编有while循环，有函数，有if，还有脚本参数，执行时　　./while w1或./while w2

[root@250-shiyan sh]# cat while
#!/bin/bash
w1 () {
min=1
max=100
while [ $min -le $max ]
do
echo $min
min=`expr $min + 1`
done
}

w2 () {
i=1
while(($i<100))
do
if(($i%4==0))
then
echo $i
fi
i=$(($i+1))
done
}

if [ $@ = w1 ]
then
w1
else
w2
fi

1.自编让其以后台进程形式存在，不用crontab去定期执行

[root@250-shiyan sh]# cat eth
#!/bin/bash
while [ 1 -gt 0 ]
do
eth=`ifconfig eth0|grep "TX bytes"|gawk '{print $6}'|cut -d ":" -f2`
echo $eth >> /root/sh/jj
sleep 2
done

[root@250-shiyan sh]# bash eth &
[root@250-shiyan sh]# tail -f jj