HP 3000 Manuals HP 3000 Manuals
Chapter 9 Reading from a File
This chapter describes, through program examples, various ways that you
can use file system intrinsics to transfer data to your program from a
disk file or device file. This chapter is intended to illustrate topics
introduced in chapter 7, "Record Selection and Data Transfer". This
chapter is divided into the following topics:
* "Sequential Access and Random Access" discusses two common methods
of record selection and data transfer, and uses examples to
illustrate the use of the FREAD and FREADDIR intrinsics.
* "Reading from $STDIN" discusses how your program can use the READ,
READX, and FREAD intrinsics to read data from the job/session
standard input device, $STDIN. An example illustrates the use of
the READ intrinsic to read a character string from $STDIN.
* "Reading from a Magnetic Tape File" provides an example of using
the FREAD intrinsic to read data from file located on magnetic
tape.
* "Reading a File Label from a Labeled Tape File" provides an
example of using the FREADLABEL intrinsic to read a user-defined
file label located on a labeled magnetic tape file.