checkShellEscape
Checks if the shell escape function is used in the code. An exclamation
point (!) indicates that the rest of the line is a command to the
operating system. This is called a shell escape. As an alternative, you
can use the MATLAB-installed function system. If your coding standards
dictate that no system calls should be used, configure
checkAvoidFunctions such that use of the system function is reported
in addition to the shell escape function.
Exemption tag: %@ok<SHESC>