Linux基礎教學：結合awk刪除hdfs指定日期前的資料

業務背景
約定五天前的HDFS資料為過期版本資料，寫一個awk指令碼自動刪除過期版本資料

$ Hadoop fs -ls /user/pms/workspace/ouyangyewei/data
Found 9 items
drwxr-xr-x  - pms pms          0 2015-08-11 17:03 /user/pms/workspace/ouyangyewei/data/2015-08-01
drwxr-xr-x  - pms pms          0 2015-08-11 17:03 /user/pms/workspace/ouyangyewei/data/2015-08-02
drwxr-xr-x  - pms pms          0 2015-08-11 17:03 /user/pms/workspace/ouyangyewei/data/2015-08-03
drwxr-xr-x  - pms pms          0 2015-08-11 17:03 /user/pms/workspace/ouyangyewei/data/2015-08-04
drwxr-xr-x  - pms pms          0 2015-08-11 17:03 /user/pms/workspace/ouyangyewei/data/2015-08-05
drwxr-xr-x  - pms pms          0 2015-08-11 17:03 /user/pms/workspace/ouyangyewei/data/2015-08-06
drwxr-xr-x  - pms pms          0 2015-08-11 17:03 /user/pms/workspace/ouyangyewei/data/2015-08-07
drwxr-xr-x  - pms pms          0 2015-08-11 17:03 /user/pms/workspace/ouyangyewei/data/2015-08-08
drwxr-xr-x  - pms pms          0 2015-08-11 17:03 /user/pms/workspace/ouyangyewei/data/2015-08-09
指令碼實現
# ---------------------------------------------------------
#
# 刪除歷史版本（五天前的為過期版本資料）
#
# ---------------------------------------------------------

old_version=$(hadoop fs -ls /user/pms/workspace/ouyangyewei/data | awk 'BEGIN{ five_days_ago=strftime("%F", systime()-5*24*3600) }{ split($8,arr,"/"); if(arr[7]<five_days_ago){printf "%sn", $8} }')
arr=(${old_version// / })
for version in ${arr[@]}
do
    hadoop fs -rmr $version
done

執行以後

$ hadoop fs -ls /user/pms/workspace/ouyangyewei/data
Found 4 items
drwxr-xr-x  - pms pms          0 2015-08-11 17:03 /user/pms/workspace/ouyangyewei/data/2015-08-06
drwxr-xr-x  - pms pms          0 2015-08-11 17:03 /user/pms/workspace/ouyangyewei/data/2015-08-07
drwxr-xr-x  - pms pms          0 2015-08-11 17:03 /user/pms/workspace/ouyangyewei/data/2015-08-08
drwxr-xr-x  - pms pms          0 2015-08-11 17:03 /user/pms/workspace/ouyangyewei/data/2015-08-09

awk賦值操作符  http://www.linuxidc.com/Linux/2015-06/118887.htm

awk跳脫序列與算術操作符  http://www.linuxidc.com/Linux/2015-06/118886.htm

AWK簡介及使用範例 http://www.linuxidc.com/Linux/2013-12/93519.htm

AWK 簡介和例子 http://www.linuxidc.com/Linux/2012-12/75441.htm

Shell指令碼之AWK文字編輯器語法 http://www.linuxidc.com/Linux/2013-11/92787.htm

正規表示式中AWK的學習和使用 http://www.linuxidc.com/Linux/2013-10/91892.htm

文字資料處理之AWK 圖解 http://www.linuxidc.com/Linux/2013-09/89589.htm

如何在Linux中使用awk命令 http://www.linuxidc.com/Linux/2014-10/107542.htm

文字分析工具-awk  http://www.linuxidc.com/Linux/2014-12/110939.htm

本文永久更新連結地址：http://www.linuxidc.com/Linux/2015-08/121539.htm