I usually do something like that: [ -z "$1" ] && echo "Invalid first parameter!" >&2 && exit 127 as a precondition. I must admit that it's longer to write

I usually do something like that: [ -z "$1" ] && echo "Invalid first parameter!" >&2 && exit 127 as a precondition. I must admit that it's longer to write, but I can write a bunch of preconditions for my function then write the logic with an appeased mind