ken@ibm-laptop:~/tmp> echo $PATH
<list of unrelated paths>:.
ken@ibm-laptop:~/tmp> which test_shebang.pl
/home/ken/tmp/test_shebang.pl
ken@ibm-laptop:~/tmp> ls -l test_shebang.pl
-rwxr-xr-x 1 ken users 48 Mar 24 10:29 test_shebang.pl