保留最新N份備份目錄指令碼

如下所示，在/opt/backup下是備份目錄，只需要保留最新的三份備份，在此之前的備份目錄都要刪除。

[root@syslog-ng ~]# cd /opt/backup/

[root@syslog-ng backup]# ls -l
total 68
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180626
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180627
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180628
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180629
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180630
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180631
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180701
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180702
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180703
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180704
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180705
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180706
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180707
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180708
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180709
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180710
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180711
[root@syslog-ng backup]# /bin/ls -l |grep "^d"
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180626
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180627
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180628
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180629
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180630
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180631
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180701
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180702
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180703
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180704
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180705
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180706
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180707
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180708
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180709
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180710
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180711
[root@syslog-ng backup]# /bin/ls -l |grep "^d"|awk ''
20180626
20180627
20180628
20180629
20180630
20180631
20180701
20180702
20180703
20180704
20180705
20180706
20180707
20180708
20180709
20180710
20180711
[root@syslog-ng backup]# /bin/ls -l |grep "^d"|awk ''|wc -l
17[root@syslog-ng backup]# /usr/bin/expr 17 - 3 
14

處理指令碼如下

[root@syslog-ng backup]# cat /opt/del.sh

#!/bin/bash
cd /opt/backup
num1=$(/bin/ls -l |grep "^d"|awk ''|wc -l)
num2=$(/usr/bin/expr $num1 - 3)
/bin/ls -l |grep "^d"|awk ''|/bin/sed -n "1,$num2 p"|xargs rm -rf

授予指令碼執行許可權

[root@syslog-ng backup]# chmod 755 /opt/del.sh

執行指令碼

[root@syslog-ng backup]# sh /opt/del.sh

執行指令碼後，發現保留下來的備份目錄就行最新的三份了

[root@syslog-ng backup]# ll

total 12
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180709
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180710
drwxr-xr-x. 2 root root 4096 jul 11 14:48 20180711

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