Pattern: Calling undefined function
Issue: -
You are calling a function that you are defining later in the file. The function definition must come first.
Function definitions are much like variable assignments, and define a name at the point the definition is "executed". This is why they must happen before their first use.
This is especially apparent when defining functions conditionally:
case "$(uname -s)" in
Linux) hi() { echo "Hello from Linux"; } ;;
Darwin) hi() { echo "Hello from macOS"; } ;;
*) hi() { echo "Hello from something else"; } ;;
esac
hi
Example of incorrect code:
#!/bin/sh
somefunction
somefunction() {
echo "Hello World"
}Example of correct code:
#!/bin/sh
somefunction() {
echo "Hello World"
}
somefunction