Why you should care
The first line is useful as it tells the OS what interpreter to invoke in order to run the script. In this case, the interpreter is the KSH interpreter. Without this line, the KSH interpreter cannot used to run this script.
The first line in KSH is useful to consider as it allows the KSH code to be more resillient and run efficiently without the potential of having bugs and thus, leading to greater productivity.
How we detect
This code insight shows that if the first line begins with #!, then the shell interpreter is specified by which the script is to be executed. If this indication is missing, the default interpreter is invoked. If the script is not compliant with the default interpreter, an error will occur.
About CAST and Highlight’s Code Insights
Over the last 25 years, CAST has leveraged unique knowledge on software quality measurement by analyzing thousands of applications and billions of lines of code. Based on this experience and community standards on programming best practices, Highlight implements hundreds of code insights across 15+ technologies to calculate health factors of a software.