help with sh script

[Alejandro Pulver]

On Sun, 3 Jul 2005 14:59:32 -0400
"fbsd_user" <fbsd_user at a1poweruser.com> wrote:

> 
> 
> std_text='No ALTQ support in kernel ALTQ related functions disabled'
> ret_ob='No ALTQ support in kernel ALTQ related functions disabled
> OK'
> 
> ret_ob=`printf "$ret_ob" | sed 's/\$std_text//g'`
> Does not strip off the std_text stuff.
> 
> How would I code a statement to remove everything from $ret_ob
> but the ok at the end so $ret_ob would only contain the ok??
> 
> Some times $ret_ob will end in some error message and that is
> what I want to capture after striping off the std_text.
> 
> 
> Thanks
> 


Hello,

The problem here is that single quotes ("'") avoid variable
substitution. e.g.

var="text"
echo $var	# outputs text
echo '$var'	# outputs $var (literally)

Also the backslash avoids variable substitution when placed before a
"$". e.g.

echo $var	# outputs text
echo \$var	# outputs $var (literally)

The solution is this:

ret_ob=`printf "$ret_ob" | sed "s/$std_text//g"`
                               ^  ^           ^

Hope that helps.

Best Regards,
Ale