FORTRAN, Statements, OPEN
*Conan The Librarian
Opens an existing file or creates a new file. If you do not explicitly open a file before accessing it, the file is created (for write operations) or opened with default attributes. OPEN (par[,par]...) par Is a keyword specification in one of the following forms: keywd keywd=value keywd Is a keyword. (See the subtopic headings listed at the end of this Help topic.) value Is a keyword value. (Some keywords do not have keyword values.) If an OPEN statement is executed for a unit that is already open, and the file pathname (or specification) is different from that of the current open file, the previously opened file is closed and the new file is opened. If the file pathname (or specification) is the same for both files, the new value of the BLANK= specifier is in effect, but the position of the file is unaffected. Keyword specifications can appear in any order. In most cases, they are optional. Default values apply in their absence. If the logical unit specifier is the first parameter in the list, the UNIT keyword is optional. You can specify character values at run time by substituting a general character expression for a keyword value in the OPEN statement. The character value can contain trailing spaces but not leading or embedded spaces; for example: CHARACTER*6 FINAL /' '/ ... IF (exp) FINAL = 'DELETE' OPEN (UNIT=1, STATUS='NEW', DISP=FINAL) NOTE Keyword values that are numeric expressions can be any integer or real expression. The value of the expression is converted to integer data type before it is used in the OPEN statement.
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