Hi
On Tuesday 08 January 2008 14:00:38 Sebastian Reitenbach wrote:
> Hi,
>
> I want to substitue some variable names, to build another variable,
> therefore I have a script like this:
>
> #!/bin/bash
> NETS="NET0 NET1 NET2"
> NET0_IF=eth0
> NET1_IF=eth1
> NET2_IF=eth2
>
> CNT=0
> for NET in $NETS;do
> echo ${${NET}_IF}
> done
>
> What I want is the output to look like like:
> eth0
> eth1
> eth2
>
> but whatever I try, it ends with a "bad substitution", or wrong output.
>
> Is there a way of this kind of double substitution in bash?
>
Use "eval"
#!/bin/bash
NETS="NET0 NET1 NET2"
NET0_IF=eth0
NET1_IF=eth1
NET2_IF=eth2
CNT=0
for NET in $NETS;do
eval echo \$${NET}_IF
done
regards,
Jonas
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