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Full Discussion: Help with the idea of a script to modify time
Top Forums Shell Programming and Scripting Help with the idea of a script to modify time Post 302459583 by frans on Tuesday 5th of October 2010 04:12:20 AM
Old 10-05-2010
Quote:
Originally Posted by michaelrozar17
Could you pls explain the below part of the code
Code:
date -u --date "19700101 $1 sec" "+%Y-%m-%d %T"

That adds $1 (the parameter passed to the function) seconds to the initial date (start point) of Unix timestamp (which is 1970-01-01). That function is used to convert timestamp to a readable date.
-u stands for UTC time
--date option is longname of -d (i could write -d instead).

Code:
T=$(date -d "${B::8} ${B:8:2}:${B:10:2}:${B:12:2}" +%s)

Shell expansion ${<variable>:<start>:<length>} returns a <length> string from <start> character (0 is the first) from <variable>.
0's can be ommited so the ${B::8} is like ${B:0:8}
That is used to extract dat from original date (which isn't recognized by the date command) and the +%s is the format of the Unix timestamp. So it converts the date in the file to timestamp (which is needed for calculation).

Hope this helps.
 

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LEARN ABOUT DEBIAN

ecaccess-file-move

ECACCESS-FILE-MOVE(1p)					User Contributed Perl Documentation				    ECACCESS-FILE-MOVE(1p)

NAME

       ecaccess-file-move - Move or Rename ECaccess Files

SYNOPSIS

       ecaccess-file-move -version|-help|-manual

       ecaccess-file-move [-debug] source-ecaccess-file target-ecaccess-file

DESCRIPTION

       Allow moving an ECaccess File. When the move occurs within the same ECaccess File System then it is a rename. When the move occurs across
       two different ECaccess File Systems then first a copy is done and then a delete of the original file is done (e.g. similar to ecaccess-
       file-copy ... -erase).

       The source-ecaccess-file and target-ecaccess-file are in the form [domain:][/user-id/]path. Please read the "Shell commands -> File
       Management" section of the "ecaccess" guide for more information on the ECaccess File System.

ARGUMENTS

       source-ecaccess-file
	       The source ECaccess File name.

       target-ecaccess-file
	       The target ECaccess File name.

OPTIONS

       -version
	       Display version number and exits.

       -help   Print a brief help message and exits.

       -manual Prints the manual page and exits.

       -debug  Display the SOAP messages exchanged.

EXAMPLES

       ecaccess-file-move ec:test1.txt ec:test2.txt

       Rename the test1.txt file in the ECFS directory of the authenticated user in test2.txt.

       ecaccess-file-move ec:test1.txt home:test2.txt

       Copy the test1.txt file from the ECFS directory of the authenticated user to the test2.txt file in the $HOME directory of the authenticated
       user, then delete the test1.txt file from ECFS.

SEE ALSO

       ecaccess-file-delete, ecaccess-file-get, ecaccess-file-mget, ecaccess-file-modtime, ecaccess-file-mput, ecaccess-file-rmdir, ecaccess-file-
       copy, ecaccess-file-dir, ecaccess-file-mdelete, ecaccess-file-mkdir, ecaccess-file-chmod, ecaccess-file-put, ecaccess-file-size and
       ecaccess.

perl v5.14.2							    2012-04-16						    ECACCESS-FILE-MOVE(1p)
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