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Table of Contents
[CHEATSHEET] OpenVMS
Main concepts
Keywords
| sort code | Full name | Translation to linux |
|---|---|---|
| UAF | User authorization File | It's a combination of etc/passwd, etc/group and SElinux/DB concepts with grants and roles |
| UIC | User Identification CODE | UID the user identificator, in OpenVMS is [1,100]. As in linux should NOT be unique |
| DCL | Digital Command Language | bash  |
| CDU | Command definition utility | It's a kind of IDE or getops, allow command line definitions |
| RMS | Record Management Services | journalctl (logs) |
| JBC | Job Controller | Queues |
| Symbol | - | A variable… |
key concepts
| OpenVMS | Linux | Comment |
|---|---|---|
SYS$MANAGER:SYLOGIN.COM | /etc/bashrc | |
SYS$LOGIN:LOGIN.COM | ${HOME}/.bashrc | |
CTRL/Y | CTRL+C | when writing a command and you have a mistake, cancel the input (similar to sqlplus and CTRL+C) |
CTRL/Z | CTRL+C | Similar but on a interactive input prompt (running a cmd in interactive input mode) |
! | # | comment delimiter |
% | nothing here | Error message delimiter |
^-(.*) | nothing here | Continue a message. For example 1st line begin with % and 2nd line with - |
Error levels
| alpha | numeric | level |
|---|---|---|
-S- | 1 | Success |
-I- | 3 | INFO |
-W- | 0 | Warning |
-E- | 2 | Error |
-F- | 4 | SEVERE |
Programming
More or less
Symbols (Variables)
| Creation | Description |
|---|---|
SYMBOLNAME = <value> | Creates a local symbol (string or integer) |
SYMBOLNAME == <value> | Creates a global symbol (string or integer) |
SYMBOLNAME := <value> | Creates a local STRING symbol |
SYMBOLNAME :== <value> | Creates a global STRING symbol |
DELETE/SYMBOL SYMBOLNAME | Destroy local variableSYMBOLNAME |
DELETE/SYMBOL/GLOBAL SYMBOLNAME | Destroy global variable SYMBOLNAME |
SHOW SYMBOL SYMBOLNAME | Show content of the variable SYMBOLNAME |
Aliases through symbols
Create an alias EDT' with a frequently used command:
<code DCL>
EDT :== EDIT/EDT/COMMAND=SYS$LOGIN:EDTINI.DDT
</code>
Replace a command with the command you want:
<code DCL>
PRINT :== PRINT/NOBURST/NOFLAG/NOTRAILER/NOTIFY
</code>
This will replace the command PRINT with PRINT/NOBURST/NOFLAG/NOTRAILER/NOTIFY everytime you launch it.
===== Operations with symbols =====
==== Arithmetic operations (integers) ====
<code DCL>
$ APPLES = 10
$ SHOW SYMBOL APPLES
APPLES = 10 Hex = 0000000A Octal = 00000000012
</code>
====== Startup ======
===== Show available boot devices =====
<code DCL>
show device
</code>
===== boot from device =====
<code DCL>
boot [DEVICE]
</code>
ex:
<code DCL>
boot DKA0
</code>
===== Login =====
root is SYSTEM:
<code DCL>
Welcome to OpenVMS (TM) Alpha Operating System, Version V8.3
Username: SYSTEM
Password:
</code>
===== Logout =====
<code DCL>
LOGOUT
</code>
<code DCL>
LOGOUT/FULL
</code>
====== Basic Commands ======
===== df =====
<code DCL>
SHOW DEVICE SYS$SYSDEVICE
</code>
===== See system parameters =====
To check the values of your system parameters, enter the following command:
<code DCL>
RUN SYS$SYSTEM:SYSGEN
</code>
And then under SYSGEN> prompt, you can list parameters, for example:
<code DCL>
SHOW WSMAX
</code>
===== Show system pagelets =====
<code DCL>
WRITE SYS$OUTPUT F$GETSYI(“CONTIGGBLPAGES”)
</code>
===== Show free pagelets =====
<code DCL>
WRITE SYS$OUTPUT F$GETSYI(“FREEGBLSECTS”)
</code>
===== Generate more pagelets =====
<code DCL>
AUTOGEN
</code>
===== Find how many pagelets are used by EXE =====
In this case DCLTABLES.EXE''
DIRECTORY/SIZE SYS$LIBRARY:DCLTABLES.EXE
System config
change system config
You have to edit:
SYS$SYSTEM:MODPARAMS.DAT
Still don't know how to edit…
update system parameters and reboot
@SYS$UPDATE:AUTOGEN GETDATA REBOOT
Change dynamic parameters using SYSGEN
Run SYSGEN
RUN SYS$SYSTEM:SYSGEN
SYSGEN: Modify parameter
And (example):
SYSGEN> USE ACTIVE SYSGEN> SET GBLPAGES 100000 SYSGEN> WRITE ACTIVE SYSGEN> EXIT
SYSGEN: List all parameters
SHOW /ALL