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Full Discussion: Weird behavior of command "local"
Top Forums Shell Programming and Scripting Weird behavior of command "local" Post 302961075 by chebarbudo on Monday 23rd of November 2015 04:45:35 PM
Old 11-23-2015
Thanks MadeInGermany, I know :+ and :- very well.
In my particular case, I actually need to know if a var is set. Example: In a function, I need to parse an argument and at the same time tell if it matches a regular expression.
Code:
foo:~# cat /tmp/test
#!/bin/bash
f1() {
    local user domain
    unset user domain
    eval $(
        echo "$1" | sed -rn 's/^([a-z0-9.]+)@([a-z0-9.]+)$/user=\1;domain=\2/p'
    )
    if [[ ${user+set} = set ]]; then
        echo "this is an email address. the usename is $user. the domain is $domain"
    else
        echo "$1 is not an email address"
        return 1
    fi
}
f1 "$@"
foo:~# bash /tmp/test me@mail.com
this is an email address. the usename is me. the domain is mail.com
foo:~# bash /tmp/test dummy
dummy is not an email address

Of course this is a bare simple example and it's not accurate. But it tells you my original purpose. In the case of bash-3.x, the script fails if you remove the unset command.

Cheers
Santiago
 

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LEARN ABOUT CENTOS

script-email

SCRIPT-EMAIL(8) 					  System Administration Commands					   SCRIPT-EMAIL(8)

NAME

       script-email - Amanda script to send email notifications

DESCRIPTION

       script-email is an Amanda script implementing the Script API. It should not be run by users directly. It sends a notification email to the
       addresses specified in the MAILTO property.

PROPERTIES

       This section lists the properties that control script-email's functionality. See amanda-scripts(7) for information on the Script API,
       script configuration.

       MAILTO

	   List of email addresses that will receive an email on command execution. It is a multi-valued property:
	     property "MAILTO" "amanda@domain.com" "sysadmin@domain.com" "amandauser@domain.com"

EXAMPLE

       In this example, script-email is scheduled to be run before the DLE, on the server.  The unqualified email address amanda will be passed to
       the email system unchanged.  The script is then attached to a dumptype, which can then be specified for any DLEs which require
       notification.
	define script-tool pre-email {
	  comment "email me before this DLE is backed up"
	  plugin  "script-email"
	  execute-on pre-dle-backup
	  execute-where server
	  property "mailto" "amanda"
	}

	define dumptype user-tar-email {
	  user-tar
	  script "pre-email"
	}

SEE ALSO

       amanda(8), amanda.conf(5), amanda-client.conf(5), amanda-scripts(7)

       The Amanda Wiki: : http://wiki.zmanda.com/

AUTHORS

       Jean-Louis Martineau <martineau@zmanda.com>
	   Zmanda, Inc. (http://www.zmanda.com)

       Dustin J. Mitchell <dustin@zmanda.com>
	   Zmanda, Inc. (http://www.zmanda.com)

Amanda 3.3.3							    01/10/2013							   SCRIPT-EMAIL(8)
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