CentOS - Feb 2017 - Problems with my simple write conf files method

I have been creating conf files and similar with the following method 
that I picked up (I think from psotfix docs):

cat <<EOF>>/etc/aliases || exit 1
root: youremail
EOF

See: http://medon.htt-consult.com/Centos7-armv7.html

But with postfixadmin I stumbled onto a problem.  The following:

cat <<EOF>/usr/share/postfixadmin/config.local.php || exit 1
<?php
$CONF['database_type'] = 'mysqli';
$CONF['database_user'] = 'postfix';
$CONF['database_password'] = 'xyz';
$CONF['database_name'] = 'postfix';

$CONF['configured'] = true;
?>
EOF

produces:

cat <<EOF>/usr/share/postfixadmin/config.local.php || exit 1
<?php
['database_type'] = 'mysqli';
['database_user'] = 'postfix';
['database_password'] = 'xyz';
['database_name'] = 'postfix';

['configured'] = true;
?>

That is the '$CONF' gets processed.

What can I do to avoid this (and any other 'gotchas') or can someone 
provide an alternative?

thanks

I have never used this method per se, but in general in any script if you want
to preserve the $ (dollar sign) or variable name you must use a backslash to
preserve it. For example change your $CONF to \$CONF.? The $CONF should then be
printed into your conf file.
KM

      From: Robert Moskowitz <rgm at htt-consult.com>
 To: centos at centos.org 
 Sent: Tuesday, February 21, 2017 10:50 AM
 Subject: [CentOS] Problems with my simple write conf files method
   
I have been creating conf files and similar with the following method 
that I picked up (I think from psotfix docs):

cat <<EOF>>/etc/aliases || exit 1
root: youremail
EOF

See: http://medon.htt-consult.com/Centos7-armv7.html

But with postfixadmin I stumbled onto a problem.? The following:

cat <<EOF>/usr/share/postfixadmin/config.local.php || exit 1
<?php
$CONF['database_type'] = 'mysqli';
$CONF['database_user'] = 'postfix';
$CONF['database_password'] = 'xyz';
$CONF['database_name'] = 'postfix';

$CONF['configured'] = true;
?>
EOF

produces:

cat <<EOF>/usr/share/postfixadmin/config.local.php || exit 1
<?php
['database_type'] = 'mysqli';
['database_user'] = 'postfix';
['database_password'] = 'xyz';
['database_name'] = 'postfix';

['configured'] = true;
?>

That is the '$CONF' gets processed.

What can I do to avoid this (and any other 'gotchas') or can someone 
provide an alternative?

thanks

_______________________________________________
CentOS mailing list
CentOS at centos.org
https://lists.centos.org/mailman/listinfo/centos

On 02/21/2017 11:03 AM, KM wrote:
> I have never used this method per se, but in general in any script if you
want to preserve the $ (dollar sign) or variable name you must use a backslash
to preserve it. For example change your $CONF to \$CONF.  The $CONF should then
be printed into your conf file.
Thanks that worked.

> KM
>
>        From: Robert Moskowitz <rgm at htt-consult.com>
>   To: centos at centos.org
>   Sent: Tuesday, February 21, 2017 10:50 AM
>   Subject: [CentOS] Problems with my simple write conf files method
>     
> I have been creating conf files and similar with the following method
> that I picked up (I think from psotfix docs):
>
> cat <<EOF>>/etc/aliases || exit 1
> root: youremail
> EOF
>
> See: http://medon.htt-consult.com/Centos7-armv7.html
>
> But with postfixadmin I stumbled onto a problem.  The following:
>
> cat <<EOF>/usr/share/postfixadmin/config.local.php || exit 1
> <?php
> $CONF['database_type'] = 'mysqli';
> $CONF['database_user'] = 'postfix';
> $CONF['database_password'] = 'xyz';
> $CONF['database_name'] = 'postfix';
>
> $CONF['configured'] = true;
> ?>
> EOF
>
> produces:
>
> cat <<EOF>/usr/share/postfixadmin/config.local.php || exit 1
> <?php
> ['database_type'] = 'mysqli';
> ['database_user'] = 'postfix';
> ['database_password'] = 'xyz';
> ['database_name'] = 'postfix';
>
> ['configured'] = true;
> ?>
>
> That is the '$CONF' gets processed.
>
> What can I do to avoid this (and any other 'gotchas') or can
someone
> provide an alternative?
>
> thanks
>
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> https://lists.centos.org/mailman/listinfo/centos
>
>
>     
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> https://lists.centos.org/mailman/listinfo/centos

On Tue, 2017-02-21 at 10:50 -0500, Robert Moskowitz wrote:
> cat <<EOF>/usr/share/postfixadmin/config.local.php || exit 1
> <?php
> $CONF['database_type'] = 'mysqli';
> $CONF['database_user'] = 'postfix';
> $CONF['database_password'] = 'xyz';
> $CONF['database_name'] = 'postfix';
> 
> $CONF['configured'] = true;
> ?>
> EOF
KMs method of escaping every $ in the here document works but a simpler
method is to escape the EOF.  That tells the shell not to do variable
expansion in the document:

   cat <<\EOF>/usr/share/postfixadmin/config.local.php || exit 1


-- 
Ian

On 02/21/2017 09:27 PM, Ian Mortimer wrote:
> On Tue, 2017-02-21 at 10:50 -0500, Robert Moskowitz wrote:
>
>> cat <<EOF>/usr/share/postfixadmin/config.local.php || exit 1
>> <?php
>> $CONF['database_type'] = 'mysqli';
>> $CONF['database_user'] = 'postfix';
>> $CONF['database_password'] = 'xyz';
>> $CONF['database_name'] = 'postfix';
>>
>> $CONF['configured'] = true;
>> ?>
>> EOF
> KMs method of escaping every $ in the here document works but a simpler
> method is to escape the EOF.  That tells the shell not to do variable
> expansion in the document:
>
>     cat <<\EOF>/usr/share/postfixadmin/config.local.php || exit 1
Thank you.  I actually had problems with changes to 
/etc/postfix/master.cf where I have things like ${sender} that do not 
work as \${sender}.  So mass changes of $ to \$ did not always work.  :)

Do I end with 'EOF' or \EOF'?