exec
Replaces the current process image with a new program via execvp(3).
On success, exec does not return because the current process
image is replaced entirely. If exec does return, it means the
call failed, and the return value is false.
In the single-argument form, shell metacharacters trigger execution
via /bin/sh -c. If no metacharacters are detected, the command
is executed directly. In the multi-argument form, the first
argument is the program and subsequent arguments are passed
directly (no shell involvement).
The child inherits Perl’s %ENV (the OS environment is replaced
before exec).
Synopsis
exec("ls -la"); # shell form
exec("ls", "-la"); # list form (no shell)
exec { "ls" } "ls", "-l"; # indirect object form