2.2.1. Which shell will run the script?
When running a script in a subshell, you should define which shell should run the script. The shell type in which you wrote the script might not be the default on your system, so commands you entered might result in errors when executed by the wrong shell.
The first line of the script determines the shell to start. The first two characters of the first line should be #! , then follows the path to the shell that should interpret the commands that follow. Blank lines are also considered to be lines, so don't start your script with an empty line.
For the purpose of this course, all scripts will start with the line
#!/bin/bash
As noted before, this implies that the Bash executable can be found in /bin .
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