127 Return code from $?

Question

What is the meaning of return value 127 from $? in UNIX.

Answer 1

127 - command not found

example: $caat The error message will

bash:

caat: command not found

now you check using echo $?

Answer 2

If the IBM mainframe JCL has some extra characters or numbers at the end of the name of unix script being called then it can throw such error.