bash No such file or directory

carl@linux-Mugwump:~$ cd FAH
carl@linux-Mugwump:~/FAH$ ./fah5 -configonly
bash: ./fah5: No such file or directory
carl@linux-Mugwump:~/FAH$ ls
fah5 mpiexec
carl@linux-Mugwump:~/FAH$

What would cause an error like that? File fah5 is executable?

You need to tell the system that fah5 is an executable.
Do this by adding the executable flag.

So in your case,

You may need to run chmod in sudo, depending on the permissions on your files.

Sorry, I didn't state the platform in my post. It's Ubuntu AMD64.
Permissions were valid, file was executable. Ubuntu x86-64 does not install the 32 bit compatible libraries, and fah5 is a 32 bit application. Installing the ia32-libs corrected the problem.

Sorry I couldn't be more helpful.. glad you solved it in the end ...