How to pass enviornment variable to bash function for validation and get the string of the argument

Asked Mar 05 '18 at 10:49

Active Mar 05 '18 at 11:33

Viewed 54 times

validate() {

        if [ -z "$1" ]
        then
                echo "$1 variable does not set !"
                exit 1
        else
                echo "$1 variable is set !"
        fi

}

the problem is that when the varibal not set the $1 dosn't evaluate to any thing and im getting empty string how can i get the argument name string so i can pressent it

i call the function like this :

validate "$FOO"
Edit
My question is how to get in the function the argument name not value So it give me the "$FOO" string Im not asking how to validate the value
SO if $FOO does not set it will print me
$FOO variable does not set !

edited Mar 05 '18 at 11:33

asked Mar 05 '18 at 10:49

user63898

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You are reinventing `: ${FOO?unset}` – tripleee Mar 05 '18 at 10:54
Also, don't use uppercase for your private variables. – tripleee Mar 05 '18 at 10:55
it not the same , im talking about handling the var in the function as argument – user63898 Mar 05 '18 at 11:14
Several answers in the duplicate explain exactly how to do that. – tripleee Mar 05 '18 at 11:15
not as the function argument, again im asking how to get the argument name not value – user63898 Mar 05 '18 at 11:16
Are you positive you have read all the answers, in particular https://stackoverflow.com/a/17538964/874188? – tripleee Mar 05 '18 at 11:27
yes im sure , this validate "$FOO" : give me : 0 variable does not set ! i want it to be $FOO variable does not set ! – user63898 Mar 05 '18 at 11:32
Look. There is no way you can pass an undefined variable to a function. You can pass the label in which case `[[ -v "FOO" ]]` does exactly what you want. If you don't know how the shell works, take my word. You are wasting your own time and mine. – tripleee Mar 05 '18 at 11:35
@user63898 The only solution I could find is to use variable indirection when calling your function, i.e. `validate ${!FOO@}` – builder-7000 Mar 05 '18 at 12:10

How to pass enviornment variable to bash function for validation and get the string of the argument

0 Answers0