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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 302942016 by Corona688 on Thursday 23rd of April 2015 02:13:57 PM
Old 04-23-2015
$# is a special variable meaning "number of arguments". It gets fed into a 'case' statement to run different code for different values.

When there's 2 arguments, it does
Code:
        hdfs dfs -copyToLocal "$1"/"$2" .
        FILE="$2"

When there's 1 argument, it does

Code:
        hdfs dfs -copyToLocal "$1" .
        OLDIFS="$IFS"
        # Split $1="a/b/filename" into $1="a", $2="b", $3="filename"
        IFS="/"
                set -- $1
        IFS="$OLDIFS"

        # Get rid of "a", "b"
        shift "$(( $# - 1 ))

        FILE="$1"
        ;;

IFS is a special variable used by the shell to control splitting, and set sets the $1 $2 ... arguments to what you tell it to, used together it splits a "/path/to/file" string into "path", "to", "file".

The shift gets rid of the first $# - 1 arguments to leave the last one.

Then it runs awk '{printf "%06d|",NR} 1' "$FILE" >output.txt and exits.
 

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LEARN ABOUT LINUX

service

service(8)						      System Manager's Manual							service(8)

NAME

       service - run a System V init script

SYNOPSIS

       service SCRIPT COMMAND [OPTIONS]

       service --status-all

       service --help | -h | --version

DESCRIPTION

       service runs a System V init script in as predictable environment as possible, removing most environment variables and with current working
       directory set to /.

       The SCRIPT parameter specifies a System V init script, located in /etc/init.d/SCRIPT.  The  supported  values  of  COMMAND  depend  on  the
       invoked	script,  service  passes  COMMAND and OPTIONS it to the init script unmodified.  All scripts should support at least the start and
       stop commands.  As a special case, if COMMAND is --full-restart, the script is run twice, first with the stop command, then with the  start
       command.

       service --status-all runs all init scripts, in alphabetical order, with the status command.

EXIT CODES

       service calls the init script and returns the status returned by it.

FILES

       /etc/init.d
	      The directory containing System V init scripts.

ENVIRONMENT

       LANG, TERM
	      The only environment variables passed to the init scripts.

SEE ALSO

       /etc/init.d/skeleton,
       update-rc.d(8),
       init(8),
       invoke-rc.d(8).

								     Jan 2006								service(8)
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