Shell Programming and Scripting

What does "didn't work" mean? What is the output of:

Code:

printf "%s\n" "$INSTANCE"

Quote:

let me put in the other way

Code:

 
/tmp/test$ cat t3.sh 
#!/bin/bash
INSTANCE="font/fc-cache"
var=\$\{INSTANCE\}
echo $var
 
/tmp/test$ ./t3.sh 
${INSTANCE}

it outputs ${INSTANCE}, but i need outputs "font/fc-cache".

The code I posted doesn't output anything. What did you add to produce output?

Quote:

don't change this:"var=\$\{INSTANCE\} and i don't know the name INSTANCE.

 
/tmp/test$ cat t3.sh 
#!/bin/bash
INSTANCE="font/fc-cache"
var=\$\{INSTANCE\}
eval x=$var
echo $x
/tmp/test$ ./t3.sh 
font/fc-cache

That doesn't bear any resemblance to what you have been asking.

It is also redundant.

Why do you not just echo $INSTANCE?:

Code:

#!/bin/bash
INSTANCE=font/fc-cache
echo "$INSTANCE"

That does exactly the same as your bloated code.