Convert a date stored in a variable to epoch date Post: 302935671

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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

02-18-2015

Registered User

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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LEARN ABOUT XFREE86

shift

shift(1)                                                           User Commands                                                          shift(1)

NAME

       shift - shell built-in function to traverse either a shell's argument list or a list of field-separated words

SYNOPSIS

   sh
       shift [n]

   csh
       shift [variable]

   ksh
       * shift [n]

DESCRIPTION

   sh
       The positional parameters from $n+1 ... are renamed $1 ... . If n is not given, it is assumed to be 1.

   csh
       The  components of argv, or variable, if supplied, are shifted to the left, discarding the first component. It is an error for the variable
       not to be set or to have a null value.

   ksh
       The positional parameters from $n+1 $n+1 ... are renamed $1 ..., default n is 1. The parameter n can  be  any  arithmetic  expression  that
       evaluates to a non-negative number less than or equal to $#.

       On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:

       1.  Variable assignment lists preceding the command remain in effect when the command completes.

       2.  I/O redirections are processed after variable assignments.

       3.  Errors cause a script that contains them to abort.

       4.  Words,  following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari-
           able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation  are  not
           performed.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), ksh(1), sh(1), attributes(5)

SunOS 5.10                                                          15 Apr 1994                                                           shift(1)

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