pTAL Reference Manual (G06.24+, H06.09+, J06.03+)

B Disk File Names and HP TACL Commands
NOTE: This appendix applies only to Guardian platforms, not Windows platforms.
• Disk File Names (page 518)
• HP TACL Commands (page 520)
For information about process or device file names, see the Guardian Programmer’s Guide.
Disk File Names
A disk file name identifies a file that contains data or a program. A disk file name reflects the
specified file’s location on a NonStop system. The location of a disk file on a NonStop system is
analogous to the location of a form in a file cabinet. To find the form, you must know:
• Which file cabinet it is in
• Which drawer it is in
• Which folder it is in
• Which form it is
Analogously, to find a disk file on a NonStop system, you must know:
• Which node (system) it is on
• Which volume it is on
• Which subvolume it is on
• Which disk file it is
In general, disk file names:
• Cannot contain spaces
• Can contain ASCII characters only
• Are not case-sensitive; the following names are equivalent:
myfile
MyFile
MYFILE
• Language functions and system procedures that return file names might return them in uppercase
letters (even if the file name was originally in lowercase letters). Check the description of the
routine that you are using.
Topics:
• Parts of a Disk File Name (page 518)
• Partial File Names (page 519)
• Logical File Names (page 520)
• Internal File Names (page 520)
Parts of a Disk File Name
A disk file has a unique file name that consists of four parts, with each part separated by a period:
• A D-series node name or a C-series system name
• A volume name
• A subvolume name
• A file ID
518 Disk File Names and HP TACL Commands