Enviornment Variable in B shell (I call it nested variable)

princelinux · #1 (**permalink**) 07-01-2008

Code:

#!/bin/sh

APP_ROOT_MODE1=/opt/app1.0
APP_ROOT_MODE2=/opt/app2.0

APP_ROOT=${APP_ROOT_${APP_MODE}}


# enviornment variable APP_MODE will be exported in the terminal where 
# we run the applciation,  its value is string - MODE1 or MODE2  
# My intension is:
# when export APP_MODE=MODE1 in terminal,  APP_ROOT is /opt/app1.0
# when export APP_MODE=MODE2 in terminal,  APP_ROOT is /opt/app2.0

But the script above does not work? Any grammar error? Any trick?

Thanks in advance

zaxxon · #2 (**permalink**) 07-01-2008

Code:

Does not work

What does not work - what's the error output?

This here does not look as if it works:

Quote:

APP_ROOT=${APP_ROOT_${APP_MODE}}

Try

Code:

APP_ROOT=${APP_ROOT}_${APP_MODE}

princelinux · #3 (**permalink**) 07-01-2008

The erorr message is
line 24: ${APP_ROOT_${APP_MODE}}: bad substitution

BTW, ${APP_ROOT}_${APP_MODE} is not my intention.

Annihilannic · #4 (**permalink**) 07-02-2008

eval APP_ROOT=\${APP_ROOT_${APP_MODE}}

princelinux · #5 (**permalink**) 07-02-2008

Thanks, Annihilannic. Yes it works.

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