request: exists(File | Directory) STDLIB function

[a-frantz]

I want to do something like this:

    output {
        Array[String] labels = if exists("labels.txt") then read_lines("labels.txt") else []
    }

but am currently writing an ugly workaround to achieve the same logic.

[rhpvorderman]

command <<<
my_commad

if [ ! -f "labels.txt" ] 
then touch labels.txt  # Labels.txt will be empty.
fi

>>>
output
Array[String] labels = read_lines("labels.txt")

Alternatively if the existance of the file is dependent on the inputs you could use those rather than checking for the existence of the file.