Intel(R) Fortran Compiler for Linux* Systems User's Guide Volume I ...

Intel® Fortran Compiler for Linux* Systems User's Guide Volume I: Building
Applications
The INQUIRE statement returns information about a file and has three forms:
• Inquiry by unit
• Inquiry by file name
• Inquiry by output item list
Inquiry by Unit
An inquiry by unit is usually done for an opened (connected) file. An inquiry by
unit causes the Intel Fortran RTL to check whether the specified unit is
connected or not. One of the following occurs, depending on whether the unit is
connected or not:
If the unit is connected:
• The EXIST and OPENED specifier variables indicate a true value.
• The pathname and file name are returned in the NAME specifier variable
(if the file is named).
• Other information requested on the previously connected file is returned.
• Default values are usually returned for the INQUIRE specifiers also
associated with the OPEN statement.
• The RECL value unit for connected formatted files is always 1-byte units.
For unformatted files, the RECL unit is 4-byte units, unless you specify the
-assume byterecl option to request 1-byte units.
If the unit is not connected:
• The OPENED specifier indicates a false value.
• The unit NUMBER specifier variable is returned as a value of -1.
• Any other information returned will be undefined or default values for the
various specifiers.0
For example, the following INQUIRE statement shows whether unit 3 has a file
connected (OPENED specifier) in logical variable I_OPENED, the name (casesensitive)
in character variable I_NAME, and whether the file is opened for
READ, WRITE, or READWRITE access in character variable I_ACTION:
INQUIRE (3, OPENED=I_OPENED, NAME=I_NAME, ACTION=I_ACTION)
Inquiry by File Name
An inquiry by name causes the Intel Fortran RTL to scan its list of open files for a
matching file name. One of the following occurs, depending on whether a match
occurs or not:
154