Re: Comparing strings

> Try changing your ssh command to be: 
> 
> ssh [email protected] dd of=/backup/images/${ARG}_0.img 
> 

That works! Thank you again. 

On Wednesday, July 14, 2021 at 11:58:17 AM UTC-4, Grant Taylor wrote:
> On 7/14/21 9:42 AM, ELCV wrote: 
> > A new issue. I am evaluating my script so I am using echo to display 
> > the commands. 
> > 
> > My function is as follows: 
> > singleVolume(){ 
> > # OS Volumes 
> > echo "virsh suspend $ARG" 
> > echo "dd if=/dev/vg0/$ARG_0 | ssh [email protected] dd of=/backup/images/$ARG_0.img" 
> > echo "virsh resume $ARG" 
> > } 
> > 
> > When I run my command the $ARG variable in the second line is not echoed: 
> > 
> > virsh suspend FOO 
> > dd if=/dev/vg0/ | ssh [email protected] dd of=/backup/images/.img 
> > virsh resume LIMS2 
> > 
> > So the variable and the _0 are being dropped. I've tested without 
> > "echo" and obtained the same result. 
> > 
> > If I create a new variable, SUFF="_0" and then use echo 
> > "dd if=/dev/vg0/$ARG$SUFF | ssh [email protected] dd 
> > of=/backup/images/$ARG$SUFF.img" 
> > 
> > It works. Is this expected? It only seems an issue using functions.
> I don't know if I would /expect/ it per se or not. But I am not at all 
> surprised by it. 
> 
> This hints at an escaping problem to me. Maybe. Maybe not. 
> 
> Try changing your ssh command to be: 
> 
> ssh [email protected] dd of=/backup/images/${ARG}_0.img 
> 
> Avoid the abiguity of what is variable vs appended string. 
> 
> Aside: That might not be the escaping that I was referring to as 
> escaping would usually be how your local shell interprets $ARG, or not, 
> prior to sending it to the remote shell / sub-command. Escaping is more 
> about where the expansion should happen. And I think your primary / 
> current issue is what is the variable vs data. 
> 
> > Thanks. 
> 
> You're welcome.
> -- 
> Grant. . . . 
> unix || die