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Top Forums Shell Programming and Scripting Convert a date stored in a variable to epoch date Post 302935671 by RudiC on Wednesday 18th of February 2015 01:10:03 PM
Old 02-18-2015
There seems to be a misapprehension of here documents. man bash (but similar for ksh):
Quote:
. . . all lines of the here-document are subjected to parameter expansion, command substitution, and arithmetic expansion, the character sequence \<newline> is ignored, and \ must be used to quote the characters \, $, and `.
On the other hand, simple commands are NOT run nor are assignments performed. So, some rearrangements and some simple modification get you nearer to your goal, but you can't achieve it:
Code:
for s in server ; do
from_date="12-Jan-2015 12:02:09"                        # works in same shell
to_date="24-Jan-2015 13:02:09"                          # same
ssh -T $s <<-EOF
$(echo $from_date)                                      # same as just $from_date 
$(echo $to_date)                                        # same
$(epoch_from_date=\"`date +%s -d "$from_date"`\")       # works, but in sub shell
$(epoch_to_date=\"`date +%s -d "$to_date"`\")           # same
$(echo $epoch_from_date)                                # var is gone with sub shell
$(echo $epoch_to_date)                                  # same
EOF
done

Don't forget - the here document is fed to ssh's stdin. It should contain (malleable) commands and/or data for ssh, not the shell.

Last edited by RudiC; 02-18-2015 at 02:17 PM..
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DATETIME.SETDATE(3)							 1						       DATETIME.SETDATE(3)

DateTime::setDate - Sets the date

       Object oriented style

SYNOPSIS
public DateTime DateTime::setDate (int $year, int $month, int $day) DESCRIPTION
Procedural style DateTime date_date_set (DateTime $object, int $year, int $month, int $day) Resets the current date of the DateTime object to a different date. PARAMETERS
o $object -Procedural style only: A DateTime object returned by date_create(3). The function modifies this object. o $year - Year of the date. o $month - Month of the date. o $day - Day of the date. RETURN VALUES
Returns the DateTime object for method chaining or FALSE on failure. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.3.0 | | | | | | | Changed the return value on success from NULL to | | | DateTime. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 DateTime.setDate(3) example Object oriented style <?php $date = new DateTime(); $date->setDate(2001, 2, 3); echo $date->format('Y-m-d'); ?> Procedural style <?php $date = date_create(); date_date_set($date, 2001, 2, 3); echo date_format($date, 'Y-m-d'); ?> The above examples will output: 2001-02-03 Example #2 Values exceeding ranges are added to their parent values <?php $date = new DateTime(); $date->setDate(2001, 2, 28); echo $date->format('Y-m-d') . " "; $date->setDate(2001, 2, 29); echo $date->format('Y-m-d') . " "; $date->setDate(2001, 14, 3); echo $date->format('Y-m-d') . " "; ?> The above example will output: 2001-02-28 2001-03-01 2002-02-03 SEE ALSO
DateTime.setISODate(3), DateTime.setTime(3). PHP Documentation Group DATETIME.SETDATE(3)
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