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Full Discussion: Downloading hdfs file to local UNIX through UNIX script
Top Forums Shell Programming and Scripting Downloading hdfs file to local UNIX through UNIX script Post 302941949 by STCET22 on Thursday 23rd of April 2015 09:24:57 AM
Old 04-23-2015
Downloading hdfs file to local UNIX through UNIX script
Hi All ,
I am very new to unix script.I am aware of unix commands but never put together in unix script level.If any one can suggest me technical guidance in the below scenario that will highly beneficial.

Data have been already migrated from mainframe to Hadoop file system(HDFS).HDFS server is hosted on a unix box.HDFS file is just .txt file.We are currently downloading HDFS to local unix file system by HDFS command and then adding sequence number to the local unix file.We just want to automate this process for any file.

Currently we are using below steps :
  1. Downlading HDFS file to local unix system by below command :
    Code:
    Hdfs dfs -copyToLocal (HDFS file path) (Local directory path)

  2. Adding sequnce generated No :
    Code:
    awk '{printf "%06d,",NR} 1' File.txt >File_Output.txt


We need to automate the above process through unix script for any user provided input file .If anyone can provide me technical approach/block of code to automate the above scenario that will be real help.Thanks in advance !

---------- Post updated at 08:24 AM ---------- Previous update was at 03:52 AM ----------

Hi All ,
I have written the below script which is working for a single file.I have hardcoded the hdfs path in the script itself.And the script is creating pipe dilimited sequence generated o/p file in the local directory.We just need to modify this script for any user provided input file.Can anyone suggest me how to automate this script for any user provided input file which should not be hardcoded in the script.Any help in this regard will be highly appreciated.Thanks.

Code:
#! /bin/bash
#Downloading HDFS file to Local Unix & Reformatting

hdfs dfs -copyToLocal /user/target/file.txt .

awk '{printf "%06d|",NR} 1' file.txt >output.txt

Last edited by rbatte1; 04-30-2015 at 01:33 PM.. Reason: Added CODE and LIST=1 tags
 

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LEARN ABOUT SUSE

sieveshell

SIEVESHELL(1)						User Contributed Perl Documentation					     SIEVESHELL(1)

NAME

       sieveshell - remotely manipulate sieve scripts

SYNOPSIS

       sieveshell [--user=user] [--authname=authname] [--realm=realm] [--exec=script] server[:port]

       sieveshell --help

DESCRIPTION

       sieveshell allows users to manipulate their scripts on a remote server.	It works via MANAGESIEVE, a work in progress.

       The following commands are recognized:

	   list list scripts on server.

	   put <filename> upload script to server.

	   get <name> [<filename>] get script. if no filename display to stdout

	   delete <name> delete script.

	   activate <name> activate script.

	   deactivate deactivate all scripts.

OPTIONS

       -u user, --user=user
	   The authorization name to request; by default, derived from the authentication credentials.

       -a authname, --authname=authname
	   The user to use for authentication (defaults to current user).

       -r realm, --realm=realm
	   The realm to attempt authentication in.

       -e script, --exec=script
	   Instead of working interactively, run commands from script, and exit when done.

REFERENCES

       [MANAGESIEVE] Martin, T.; "A Protocol for Remotely Managing Sieve Scripts", draft-ietf-managesieve-03.txt, Mirapoint, Inc.; May 2001, work
       in progress.

AUTHOR

       Tim Martin <tmartin@mirapoint.com>, and the rest of the Cyrus team <cyrus-bugs@andrew.cmu.edu>.

perl v5.10.0							    2008-04-04							     SIEVESHELL(1)
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