[linux定义变量赋值]Linux定义变量脚本分享

更新时间:2024-03-22    来源:linux    手机版     字体:

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本文实例为大家分享了Linux定义变量脚本,供大家参考,具体内容如下

现有两段基本一样的代码,只是变量进行改变,其他都没有变化,但是执行过程中出现了不一样的结果

代码一:

vi back.sh
#backup import file,such as /etc/rc.local /var/spool/cron/root
IP=$(ifconfig eth1|sed -nr "2s#.*addr:(.*) B.*#\1#gp")
Path=/backup
if [ $(date +%w) -eq 0 ]
then
  Time=$(date +%F-%w -d "-1 day")
else
  Time=$(date +%F "-1 day")
fi
mkdir $Path/$IP -p
cd / &&\
tar zcfh $Path/$IP/backup_$Time.tar.gz var/spool/cron/root etc/rc.local etc/sysconfig/iptables var/www/html app/logs &&\
md5sum $Path/$IP/backup_$Time.tar.gz >$Path/$IP/flag_$Time.log &&\
rsync -azv $Path/ rsync_backup@172.16.1.41::backup --password-file=/etc/rsyncd.password &&\
find $Path/ -type f \( -name "*.log" -o -name "*.tar.gz" \) -mtime +7 |xargs rm –f
"back.sh" 15L, 628C written

代码二:

vi back.sh
#backup import file,such as /etc/rc.local /var/spool/cron/root
IP=$(ifconfig eth1|sed -nr "2s#.*addr:(.*) B.*#\1#gp")
Path=/backup
if [ $(date +%w) -eq 0 ]
then
  Time=$(date +%F-%w -d "-1 day")
else
  Time=$(date +%F "-1 day")
fi
mkdir $Path/$IP -p
cd / &&\
tar zcfh /backup/$IP/backup_$Time.tar.gz var/spool/cron/root etc/rc.local etc/sysconfig/iptables var/www/html app/logs &&\
md5sum $Path/$IP/backup_$Time.tar.gz >$Path/$IP/flag_$Time.log &&\
rsync -azv $Path/ rsync_backup@172.16.1.41::backup --password-file=/etc/rsyncd.password &&\
find $Path/ -type f \( -name "*.log" -o -name "*.tar.gz" \) -mtime +7 |xargs rm –f
"back.sh" 15L, 628C written

上面代码只是修改了打包的情况,tar zcf /backup和定义一个变量tar $Path/结果就出现不一样的情况,第一种执行结果是:

代码一执行结果:

[root@nfs01 backup]# ls
172.16.1.31 backup_2017-12-23-6.tar.gz flag_2017-12-23-6.log

代码二执行结果:

[root@nfs01 backup]# ls
172.16.1.31

代码一和代码二原理是一样的,但是为什么执行的结果却有差别呢?个人觉得就是环境变量的目录的开头引起的,这样让前面的环境变量失效了,打包了两次:

测试脚本

[root@nfs01 scripts]# sh -x back.sh 
++ sed -nr "2s#.*addr:(.*) B.*#\1#gp"
++ ifconfig eth1
+ IP=172.16.1.31
+ Path=/backup
++ date +%w
+ "[" 4 -eq 0 "]"
++ date +%F -d "-1 day"
+ Time=2017-12-20
+ mkdir /backup/172.16.1.31 -p
+ cd /
+ tar zcfh /backup/172.16.1.31/backup_2017-12-20.tar.gz var/spool/cron/root etc/rc.local etc/sysconfig/iptables var/www/html app/logs
+ md5sum /backup/172.16.1.31/backup_2017-12-20.tar.gz
+ rsync -azv /backup/ rsync_backup@172.16.1.41::backup --password-file=/etc/rsyncd.password
sending incremental file list
172.16.1.31/backup_2017-12-20.tar.gz
172.16.1.31/flag_2017-12-20.log

sent 1128 bytes received 65 bytes 2386.00 bytes/sec
total size is 2960 speedup is 2.48
+ xargs rm -f
+ find /backup/ -type f "(" -name "*.log" -o -name "*.tar.gz" ")" -mtime +7

测试脚本也没有出现问题,但是不知道原因是什么,求大神能够解答,不胜感谢!

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