Re: [Help-bash] here-doc / linebreaks / indirect expansion

[kardan]

Am Sun, 23 Jun 2013 21:11:35 -0400
schrieb Chet Ramey <address@hidden>:

> On 6/23/13 4:27 AM, kardan wrote:
> 
> > The substitution error is still unclear to me.
> >                                                                  
> > var=DISPLAY ; echo "$var=${!DISPLAY} === $var=${!$var}"
> 
> OK.  Let's say that DISPLAY has the value ':0'.  The way indirect
> expansion works is that the value of the indirected variable is used
> as the (new) name of the variable to be expanded.  So this turns
> into, in effect,
> 
> echo "$var=${:0} ..."
> 
> which is clearly a substitution error.  If you want to get the output
> you showed, don't use indirect expansion on DISPLAY.
Thanks! I found, that echo ${!var} does what i want. Kardan