EVL

Table of Contents


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Cp

(since EVL 1.3)

Copy <source> to <dest>, or multiple <source>(s) to <dest> directory.

On local files it calls standard ‘cp’ command to copy files, but when <source> and/or <dest> contain URI ‘hdfs://’ (i.e. Hadoop FS), then it calls appropriate commands to copy from/to such source/destination.

When more than one <source> is specified, then URI prefix must be the same for all of them.

Cp

is to be used in EVS job structure definition file or in EWS workflow structure definition.

evl cp

is intended for standalone usage, i.e. to be invoked from command line.

Using this command might keep your code clean, but for more complex copying better use appropriate commands directly, as it gives you all the available options for particular storage or protocol type.

Synopsis

syntax/Cp
Cp
  [-f|--force] [-p] <source>... <dest>

evl cp
  [-f|--force] [-p] <source>... <dest>
  [--verbose]

evl cp
  ( --help | --usage | --version )

Options

-f, --force

destination will be overwritten if exists

-p

preserve mode (i.e. permission), timestamps and ownership

Standard options:

--help

print this help and exit

--usage

print short usage information and exit

-v, --verbose

print to stderr info/debug messages of the component

--version

print version and exit

Examples

These lines in EVL job (an ‘evs’ file):

Cp hdfs:///some/path/to/file /some/local/path/
Cp /some/local/path/file hdfs:///some/path/
Cp hdfs:///some/path/file hdfs:///other/path/
Cp /some/local/path/file /other/local/path/

will call (with handling fails in proper EVL way):

evl_hdfs_get hdfs:///some/path/file /some/local/path/
evl_hdfs_put /some/local/path/file hdfs:///some/path/
evl_hdfs_cp hdfs:///some/path/file hdfs:///other/path/
cp /some/local/path/file /other/local/path/

where defaults for ‘evl_hdfs_*’ variables are:

function evl_hdfs_get { hdfs dfs -get ; }
function evl_hdfs_cp  { hdfs dfs -cp  ; }
function evl_hdfs_put { hdfs dfs -put ; }