Darya.zelenina: Created page with "A '''file extension''' or '''file type''' is a part of the file specification that may identify the file structure (such as .TXT for text files or .C for C code) or sometimes..."

2018-12-19T07:09:06Z

Created page with "A '''file extension''' or '''file type''' is a part of the file specification that may identify the file structure (such as .TXT for text files or .C for C code) or sometimes..."

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A '''file extension''' or '''file type''' is a part of the file specification that may identify the file structure (such as .TXT for text files or .C for C code) or sometimes the order in which the files should be used ([[Saveset|backup savesets]] for VMSINSTAL have the extensions .A, .B, .C, etc.).

A file type must consist of no more than 39 alphanumeric characters and may include the dollar sign ($) and the underscore(_). Empty file types are also permitted.

Assigning file types in OpenVMS is arbitrary: there is no requirement as to what type a file should have other than if the non-default file type is used, the user will have to enter the file type when using the file.

=Default file types=
Certain OpenVMS commands and utilities have default file types that are assumed in the default file specification and therefore do not need to be specified: for example, TYPE defaults to .LIS files and [[@]] defaults to .COM files.

==Default file types used by DCL commands==
{| class="wikitable"
|-
! File type !! Contents
|-
| .CLD || Command description file
|-
| .COM || [[Command procedure]] file
|-
| .DAT || Data file
|-
| .DIF || Output created by the DIFFERENCES command
|-
| .DIR || [[Directory file]]
|-
| .DIS || Distribution list file for the [[MAIL]] utility
|-
| .EDT || Startup command file for the [[EDT]] editor
|-
| .EXE || Executable program image file created by the linker
|-
| .HLB || Help text library file
|-
| .HLP || Input source file for help libraries
|-
| .INI || Initialization file
|-
| .JOU || Journal file created by the [[EDT]] editor
|-
| .LIS || Listing file created by a language compiler or assembler; default input file for the PRINT and TYPE commands
|-
| .LOG || [[Batch job]] output file
|-
| .MAI || Mail message file
|-
| .MEM || Output file created by DIGITAL Standard Runoff (DSR)
|-
| .PS || POSTSCRIPT format file
|-
| .REGIS || Regis format file
|-
| .RNO || Input source file for DIGITAL Standard Runoff (DSR)
|-
| .SIX || Sixel graphic file
|-
| .SYS || System image file
|-
| .TJL || Journal file created by the [[DECTPU]] and [[ACL editor|ACL]] editors
|-
| .TLB || Text library file
|-
| .TMP || Temporary file
|-
| .TPU || Command file for the [[EVE]] editor
|-
| .TPU$JOURNAL|| Journal file created by the [[EVE]] editor
|-
| .TXT || Input file for text libraries or Mail utility output files
|}

==Default file types for language source programs==
{| class="wikitable"
|-
! File type !! Contents
|-
| .ADA || Input source file for the Compaq Ada compiler
|-
| .BAS || Input source file for the BASIC compiler
|-
| .B32 || Input source file for the VAX BLISS-32 compiler
|-
| .C || Input source file for the Compaq C compiler
|-
| .COB || Input source file for the VAX COBOL compiler on OpenVMS VAX systems and the Compaq COBOL compiler on OpenVMS Alpha systems
|-
| .FOR || Input source file for Compaq Fortran (Compaq Fortran for OpenVMS VAX systems was formerly VAX Fortran)
|-
| .M64 || Input source file for the MACRO-64 assembler for OpenVMS Alpha
|-
| .MAP || Memory allocation map created by the Linker utility
|-
| .MAR || Input source file for the VAX MACRO assembler or the MACRO-32 Compiler for OpenVMS Alpha
|-
| .MLB || Macro library for the MACRO assembler
|-
| .MSG || Source file that specifies the text of messages
|-
| .OBJ || Object file created by a language compiler or assembler
|-
| .OLB || Object module library
|-
| .OPT || Options file for input to the LINK command
|-
| .PAS || Input source file for the Pascal compiler
|-
| .PLI || Input source file for the PL/I compiler
|-
| .STB || Symbol table file created by the Linker utility
|-
| .UPD || Update file of changes for a VAX MACRO source program; also input to the SUMSLP utility
|}

File extension - Revision history

Darya.zelenina: Created page with "A '''file extension''' or '''file type''' is a part of the file specification that may identify the file structure (such as .TXT for text files or .C for C code) or sometimes..."