Shell Programming and Scripting

Code:

temp=$( grep svcadm t1.sh )
var=${temp##* \${}
eval "$( grep "${var%\}}" t1.sh )"

Quote:

Originally Posted by honglus

Thanks alot, that almost worked, it ran the svcadm enable command instead of print the value ${INSTANCE} and it seems work for bash only, Can you write sh version to get value of ${INSTANCE} only, I need the value to check it's status with another cmd e.g 'svcs ${INSTANCE}?

It will work in any standard UNIX shell.

On some systems, /bin/sh is an old Bourne shell. Such systems should also have a POSIX shell, e.g. ksh.

See Parameter Expansion in your shell man page.

Code:

eval "$( grep INSTANCE= t1.sh )"

No, it doesn't.

it didn't work, 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".

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


that is how i made it work by creating new file, but it is stupid, any decent solution?

Code:

 
:/tmp/test$ cat t3.sh 
#!/bin/bash
INSTANCE="font/fc-cache"
var=\$\{INSTANCE\}
echo "echo $var" >t4.sh
. ./t4.sh

Code:

 
$ ./t3.sh 
font/fc-cache