Basic Linux Tutorial: Use awk to delete data before the specified date in hdfs

Basic Linux Tutorial: Use awk to delete data before the specified date in hdfs

Business background
It is agreed that the HDFS data five days ago is the expired version data, and an awk script is written to automatically delete the expired version data.

$ Hadoop fs-ls/user/pms/workspace/ouyangyewei/data
Found 9 items
Drwxr-xr-x-pms 0/user/pms/workspace/ouyangyewei/data/2015-08-01
Drwxr-xr-x-pms 0/user/pms/workspace/ouyangyewei/data/2015-08-02
Drwxr-xr-x-pms 0/user/pms/workspace/ouyangyewei/data/2015-08-03
Drwxr-xr-x-pms 0/user/pms/workspace/ouyangyewei/data/2015-08-04
Drwxr-xr-x-pms 0/user/pms/workspace/ouyangyewei/data/2015-08-05
Drwxr-xr-x-pms 0/user/pms/workspace/ouyangyewei/data/2015-08-06
Drwxr-xr-x-pms 0/user/pms/workspace/ouyangyewei/data/2015-08-07
Drwxr-xr-x-pms 0/user/pms/workspace/ouyangyewei/data/
Drwxr-xr-x-pms 0/user/pms/workspace/ouyangyewei/data/
Script implementation
#---------------------------------------------------------
#
# Delete previous versions (data of expired versions five days ago)
#
#---------------------------------------------------------

Old_version = $ (hadoop fs-ls/user/pms/workspace/ouyangyewei/data | awk 'in in {five_days_ago = strftime ("% F", systime () -5*24*3600)} {split ($8, arr, "/"); if (arr [7] <five_days_ago) {printf "% s \ n ", $8 }}')
Arr = ($ {old_version ///})
For version in $ {arr [@]}
Do
Hadoop fs-rmr $ version
Done

After execution

$ Hadoop fs-ls/user/pms/workspace/ouyangyewei/data
Found 4 items
Drwxr-xr-x-pms 0/user/pms/workspace/ouyangyewei/data/2015-08-06
Drwxr-xr-x-pms 0/user/pms/workspace/ouyangyewei/data/2015-08-07
Drwxr-xr-x-pms 0/user/pms/workspace/ouyangyewei/data/
Drwxr-xr-x-pms 0/user/pms/workspace/ouyangyewei/data/

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