HP 3000 Manuals HP 3000 Manuals
Lesson 4 Using File Equations
Q 2-10 $STDIN is the standard input device, which is
normally the terminal.
Q 2-11 OUT is the alias for $STDLIST, the standard output
device.
Q 2-12 According to the MAILPRNT equation, the HP Desk
messages will be printed on LP (line printer).
Q 2-13 To redirect HP Desk messages to the terminal
screen, you might change the file equation as
follows:
FILE MAILPRNT=$STDLIST
To redirect HP Desk messages to the line printer,
you might change the file equation as follows:
FILE MAILPRNT;DEV=LP
Q 2-14 According to the first file equation, the name and
characteristics of the file associated with FILEIN
are the following:
File name = MYFILEA
Record size = 80 bytes
Blocking factor = (default)
Record type = fixed length
File type = ASCII
Q 2-15 According to the second file equation, the name and
characteristic of the file associated with FILEOUT
are the following:
File name = MYFILEB
Record size = 80 bytes
Blocking factor = (default)
Record type = fixed length
File type = ASCII
Q 2-16 If you no longer want the FILEIN or FILEOUT
equations to be in effect, you would do the
following:
RESET FILEIN
RESET FILEOUT
Exercise 2-5: Creating and Using File Equations
2. Enter the command to display all existing file
equations:
LISTEQ
3a. To redirect output to the terminal instead of to
FILE2, change the OUT file equation as follows:
FILE OUT=$STDLIST
3b. To redirect input from FILE1, instead of from the
terminal, change the IN file equation as follows:
FILE IN=FILE;REC=-80,,F,ASCII
4a. FILE OUTPUT;DEV=LP
What is the name of the file designator? OUTPUT
What device does it refer to? line printer
4b. FILE FORMAT;DEV=LP;ENV=PICA.
HPENV.SYS
What is the name of the file designator? FORMAT
What device does it refer to? line printer
What is the environment file? PICA
What does this file equation do? It lets you print
something on the line printer using pica type.
4c. FILE INPUT=MYFILE1;REC=-80,,F,ASCII
What is the name of the file designator? INPUT
What file does it refer to? MYFILE1
What happens if a program reads from *INPUT? It
reads the contents of MYFILE1.
What size records are in the actual file? 80 byte
records
4d. FILE OUTPUT = $NULL
What is the name of the file designator? *OUTPUT
What device or file does *OUTPUT refer to? Nothing
What happens if you write to *OUTPUT? Output
disappears
5a. Prints HP Desk message #10 on the line printer.
5b. Prints the contents of MYFILE to the standard
output device (usually the terminal screen).
5c. Reads input from the standard input device (usually
the keyboard).
5d. Reads input from an already existing file called
MYFILE.
5e. Writes output to a new file called MYFILE (with the
specified characteristics).
6a. This file equation defines HIERR as the terminal
screen:
FILE HIERR=$STDLIST
6b. According to the file equation, by directing the
error listing to *HIERR, the listing should print
on the screen.
6c. To redirect the error listing to a file called
ERROR1 with default file characteristics, change
the file equation as follows:
FILE HIERR=ERROR1
6d. According to the file equation, by directing the
error listing to *HIERR, the listing should print
in the ERROR1 file.
6e. To redirect the error listing to a file called
ERROR2, change the file equation as follows:
FILE HIERR=ERROR2;REC=-80,,F,ASCII
According to the file equation, the error listing
should print in the ERROR2 file.
************ End of Exercise 2-5 *********