Why is the following bash script not working when called with nohup?
Note that to declare a function in POSIX standard shell, you just write the function name followed by a pair of empty parentheses, and a body in curly brackets:
#!/bin/bashhello() { echo "Hello World"}helloSome shells, like bash, also accept the function keyword to declare functions, but based on your error message, it looks like the shell that you are using does not accept it. For portability, it would be best to use the POSIX standard declaration style.
The reason you see the difference between running the script directly and running the script under nohup is the blank lines at the beginning of the file. The #! need to be the first two characters of the file in order to specify the interpreter, otherwise that is just a comment. It looks like when executed from within a Bash shell, the script gets interpreted by Bash and it recognizes the Bash extension. But when run from nohup, it gets interpreted by sh, which on some systems is a more bare-bones shell like dash that only supports the POSIX syntax above.