eqbridges eqbridges - 1 year ago 61
Bash Question

Assigning default values to shell variables with a single command in bash

I have a whole bunch of tests on variables in a bash (3.00) shell script where if the variable is not set, then it assigns a default, e.g.:

if [ -z "${VARIABLE}" ]; then

I seem to recall there's some syntax to doing this in one line, something resembling a ternary operator, e.g.:

FOO=${ ${VARIABLE} : 'default' }

(though I know that won't work...)

Am I crazy, or does something like that exist?

Answer Source

Very close to what you posted, actually:


Or, which will assign to VARIABLE as well:

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