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End of File and Errors

feof (fid) Built-in Function
Return 1 if an end-of-file condition has been encountered for a given file and 0 otherwise. Note that it will only return 1 if the end of the file has already been encountered, not if the next read operation will result in an end-of-file condition.

ferror (fid) Built-in Function
Return 1 if an error condition has been encountered for a given file and 0 otherwise. Note that it will only return 1 if an error has already been encountered, not if the next operation will result in an error condition.

freport () Built-in Function
Print a list of which files have been opened, and whether they are open for reading, writing, or both. For example,
freport ()

     -|  number  mode  name
     -|
     -|       0     r  stdin
     -|       1     w  stdout
     -|       2     w  stderr
     -|       3     r  myfile